21221011120 has 40 divisors (see below), whose sum is σ = 49381857216. Its totient is φ = 8481005568.

The previous prime is 21221011079. The next prime is 21221011127. The reversal of 21221011120 is 2111012212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 21221011120.

It is not an unprimeable number, because it can be changed into a prime (21221011127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22792 + ... + 207271.

Almost surely, 2^21221011120 is an apocalyptic number.

21221011120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221011120 is an abundant number, since it is smaller than the sum of its proper divisors (28160846096).

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

21221011120 is a wasteful number, since it uses less digits than its factorization.

21221011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231229 (or 231223 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221011120 its reverse (2111012212), we get a palindrome (23332023332).

The spelling of 21221011120 in words is "twenty-one billion, two hundred twenty-one million, eleven thousand, one hundred twenty".