21120221012120 has 128 divisors (see below), whose sum is σ = 47927935440000. Its totient is φ = 8375995330560.

The previous prime is 21120221012087. The next prime is 21120221012129. The reversal of 21120221012120 is 2121012202112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120221012129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4777247510 + ... + 4777251930.

It is an arithmetic number, because the mean of its divisors is an integer number (374436995625).

Almost surely, 2^{21120221012120} is an apocalyptic number.

21120221012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120221012120 is an abundant number, since it is smaller than the sum of its proper divisors (26807714427880).

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

21120221012120 is a wasteful number, since it uses less digits than its factorization.

21120221012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6613 (or 6609 counting only the distinct ones).

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

Adding to 21120221012120 its reverse (2121012202112), we get a palindrome (23241233214232).

The spelling of 21120221012120 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, twelve thousand, one hundred twenty".