21121312013020 has 24 divisors (see below), whose sum is σ = 44399877094944. Its totient is φ = 8439930163776.

The previous prime is 21121312012993. The next prime is 21121312013057. The reversal of 21121312013020 is 2031021312112.

It is a super-2 number, since 2×21121312013020² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537144939 + ... + 537184258.

It is an arithmetic number, because the mean of its divisors is an integer number (1849994878956).

Almost surely, 2^{21121312013020} is an apocalyptic number.

21121312013020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121312013020 is an abundant number, since it is smaller than the sum of its proper divisors (23278565081924).

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

21121312013020 is a wasteful number, since it uses less digits than its factorization.

21121312013020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074330189 (or 1074330187 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21121312013020 its reverse (2031021312112), we get a palindrome (23152333325132).

The spelling of 21121312013020 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twelve million, thirteen thousand, twenty".