21115530264060 has 144 divisors (see below), whose sum is σ = 66856256603136. Its totient is φ = 5384296976256.

The previous prime is 21115530264043. The next prime is 21115530264079. The reversal of 21115530264060 is 6046203551112.

21115530264060 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 5 + 5 + 3 + 0 + 2 + 640 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12393997 + ... + 13994363.

It is an arithmetic number, because the mean of its divisors is an integer number (464279559744).

Almost surely, 2^{21115530264060} is an apocalyptic number.

21115530264060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21115530264060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33428128301568).

21115530264060 is an abundant number, since it is smaller than the sum of its proper divisors (45740726339076).

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

21115530264060 is a wasteful number, since it uses less digits than its factorization.

21115530264060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603592 (or 1603587 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 21115530264060 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, two hundred sixty-four thousand, sixty".