21221012120120 has 16 divisors (see below), whose sum is σ = 47747277270360. Its totient is φ = 8488404848032.

The previous prime is 21221012120083. The next prime is 21221012120129. The reversal of 21221012120120 is 2102121012212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221012120129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265262651462 + ... + 265262651541.

Almost surely, 2^{21221012120120} is an apocalyptic number.

21221012120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221012120120 is an abundant number, since it is smaller than the sum of its proper divisors (26526265150240).

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

21221012120120 is a wasteful number, since it uses less digits than its factorization.

21221012120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530525303014 (or 530525303010 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221012120120 its reverse (2102121012212), we get a palindrome (23323133132332).

The spelling of 21221012120120 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred twenty thousand, one hundred twenty".