2217151820 has 48 divisors (see below), whose sum is σ = 5032183968. Its totient is φ = 815700480.

The previous prime is 2217151801. The next prime is 2217151823. The reversal of 2217151820 is 281517122.

It is not an unprimeable number, because it can be changed into a prime (2217151823) 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, 57887 + ... + 88233.

It is an arithmetic number, because the mean of its divisors is an integer number (104837166).

Almost surely, 2^2217151820 is an apocalyptic number.

2217151820 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 2217151820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2516091984).

2217151820 is an abundant number, since it is smaller than the sum of its proper divisors (2815032148).

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

2217151820 is a wasteful number, since it uses less digits than its factorization.

2217151820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30650 (or 30648 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 2217151820 is about 47086.6416300844. The cubic root of 2217151820 is about 1303.9626268976.

Adding to 2217151820 its reverse (281517122), we get a palindrome (2498668942).

The spelling of 2217151820 in words is "two billion, two hundred seventeen million, one hundred fifty-one thousand, eight hundred twenty".