21221111111120 has 40 divisors (see below), whose sum is σ = 49348783332864. Its totient is φ = 8486775627392.

The previous prime is 21221111111071. The next prime is 21221111111129. The reversal of 21221111111120 is 2111111112212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221111111129) 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, 25665764 + ... + 26479683.

Almost surely, 2^{21221111111120} is an apocalyptic number.

21221111111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221111111120 is an abundant number, since it is smaller than the sum of its proper divisors (28127672221744).

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

21221111111120 is a wasteful number, since it uses less digits than its factorization.

21221111111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52150547 (or 52150541 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21221111111120 its reverse (2111111112212), we get a palindrome (23332222223332).

The spelling of 21221111111120 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty".