21115344662620 has 48 divisors (see below), whose sum is σ = 48069410292288. Its totient is φ = 7744802918400.

The previous prime is 21115344662603. The next prime is 21115344662623. The reversal of 21115344662620 is 2626644351112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115344662623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268877509 + ... + 268956028.

It is an arithmetic number, because the mean of its divisors is an integer number (1001446047756).

Almost surely, 2^{21115344662620} is an apocalyptic number.

21115344662620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115344662620 is an abundant number, since it is smaller than the sum of its proper divisors (26954065629668).

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

21115344662620 is a wasteful number, since it uses less digits than its factorization.

21115344662620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537833710 (or 537833708 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 21115344662620 in words is "twenty-one trillion, one hundred fifteen billion, three hundred forty-four million, six hundred sixty-two thousand, six hundred twenty".