21220010120 has 64 divisors (see below), whose sum is σ = 48338823600. Its totient is φ = 8382668800.

The previous prime is 21220010107. The next prime is 21220010137. The reversal of 21220010120 is 2101002212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 12601858564 + 8618151556 = 112258^2 + 92834^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3475070 + ... + 3481170.

Almost surely, 2^21220010120 is an apocalyptic number.

21220010120 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 21220010120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24169411800).

21220010120 is an abundant number, since it is smaller than the sum of its proper divisors (27118813480).

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

21220010120 is a wasteful number, since it uses less digits than its factorization.

21220010120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178 (or 7174 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21220010120 its reverse (2101002212), we get a palindrome (23321012332).

The spelling of 21220010120 in words is "twenty-one billion, two hundred twenty million, ten thousand, one hundred twenty".