21523135014612 has 144 divisors (see below), whose sum is σ = 67869461971584. Its totient is φ = 5587212384000.

The previous prime is 21523135014599. The next prime is 21523135014629. The reversal of 21523135014612 is 21641053132512.

21523135014612 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 3 + 1 + 35 + 0 + 1 + 4 + 612 = 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2596162 + ... + 7055942.

It is an arithmetic number, because the mean of its divisors is an integer number (471315708136).

Almost surely, 2^{21523135014612} is an apocalyptic number.

21523135014612 is a gapful number since it is divisible by the number (22) 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 21523135014612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33934730985792).

21523135014612 is an abundant number, since it is smaller than the sum of its proper divisors (46346326956972).

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

21523135014612 is a wasteful number, since it uses less digits than its factorization.

21523135014612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461550 (or 4461545 counting only the distinct ones).

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

The spelling of 21523135014612 in words is "twenty-one trillion, five hundred twenty-three billion, one hundred thirty-five million, fourteen thousand, six hundred twelve".