21012101012120 has 32 divisors (see below), whose sum is σ = 47292043367520. Its totient is φ = 8402206433280.

The previous prime is 21012101012101. The next prime is 21012101012131. The reversal of 21012101012120 is 2121010121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012101012095 and 21012101012104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82182377 + ... + 82437656.

It is an arithmetic number, because the mean of its divisors is an integer number (1477876355235).

Almost surely, 2^{21012101012120} is an apocalyptic number.

21012101012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012101012120 is an abundant number, since it is smaller than the sum of its proper divisors (26279942355400).

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

21012101012120 is a wasteful number, since it uses less digits than its factorization.

21012101012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164623235 (or 164623231 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012101012120 its reverse (2121010121012), we get a palindrome (23133111133132).

The spelling of 21012101012120 in words is "twenty-one trillion, twelve billion, one hundred one million, twelve thousand, one hundred twenty".