21115351046620 has 24 divisors (see below), whose sum is σ = 44342378539200. Its totient is φ = 8446113496512.

The previous prime is 21115351046591. The next prime is 21115351046663. The reversal of 21115351046620 is 2664015351112.

It is a super-4 number, since 4×21115351046620⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21115351046620.

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, 5495626 + ... + 8510734.

It is an arithmetic number, because the mean of its divisors is an integer number (1847599105800).

Almost surely, 2^{21115351046620} is an apocalyptic number.

21115351046620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115351046620 is an abundant number, since it is smaller than the sum of its proper divisors (23227027492580).

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

21115351046620 is a wasteful number, since it uses less digits than its factorization.

21115351046620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365277 (or 3365275 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 21115351046620 its reverse (2664015351112), we get a palindrome (23779366397732).

The spelling of 21115351046620 in words is "twenty-one trillion, one hundred fifteen billion, three hundred fifty-one million, forty-six thousand, six hundred twenty".