2151620220 has 48 divisors (see below), whose sum is σ = 6027160608. Its totient is φ = 573515520.

The previous prime is 2151620213. The next prime is 2151620227. The reversal of 2151620220 is 220261512.

It is a happy number.

2151620220 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 (2151620213) and next prime (2151620227).

It is a super-2 number, since 2×2151620220² = 9258939142225696800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151620227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161410 + ... + 174230.

It is an arithmetic number, because the mean of its divisors is an integer number (125565846).

Almost surely, 2^2151620220 is an apocalyptic number.

2151620220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151620220 is an abundant number, since it is smaller than the sum of its proper divisors (3875540388).

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

2151620220 is a wasteful number, since it uses less digits than its factorization.

2151620220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15630 (or 15628 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2151620220 is about 46385.5604687493. The cubic root of 2151620220 is about 1290.9870097810.

Adding to 2151620220 its reverse (220261512), we get a palindrome (2371881732).

The spelling of 2151620220 in words is "two billion, one hundred fifty-one million, six hundred twenty thousand, two hundred twenty".