2151071220 has 96 divisors (see below), whose sum is σ = 6208771968. Its totient is φ = 556042752.

The previous prime is 2151071213. The next prime is 2151071227. The reversal of 2151071220 is 221701512.

2151071220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2151071213) and next prime (2151071227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151071227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 648807 + ... + 652113.

It is an arithmetic number, because the mean of its divisors is an integer number (64674708).

Almost surely, 2^2151071220 is an apocalyptic number.

2151071220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151071220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3104385984).

2151071220 is an abundant number, since it is smaller than the sum of its proper divisors (4057700748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151071220 is a wasteful number, since it uses less digits than its factorization.

2151071220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649 (or 3647 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 2151071220 is about 46379.6423013373. The cubic root of 2151071220 is about 1290.8771991755.

Adding to 2151071220 its reverse (221701512), we get a palindrome (2372772732).

The spelling of 2151071220 in words is "two billion, one hundred fifty-one million, seventy-one thousand, two hundred twenty".