21012341552523 has 96 divisors (see below), whose sum is σ = 32063496192000. Its totient is φ = 13234265290752.

The previous prime is 21012341552509. The next prime is 21012341552597. The reversal of 21012341552523 is 32525514321012.

21012341552523 is a `hidden beast` number, since 2 + 1 + 0 + 12 + 3 + 41 + 552 + 52 + 3 = 666.

It is not a de Polignac number, because 21012341552523 - 2¹² = 21012341548427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012341553523) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4169940238 + ... + 4169945276.

It is an arithmetic number, because the mean of its divisors is an integer number (333994752000).

Almost surely, 2^{21012341552523} is an apocalyptic number.

21012341552523 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21012341552523 is a deficient number, since it is larger than the sum of its proper divisors (11051154639477).

21012341552523 is a wasteful number, since it uses less digits than its factorization.

21012341552523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5953 (or 5950 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 21012341552523 its reverse (32525514321012), we get a palindrome (53537855873535).

The spelling of 21012341552523 in words is "twenty-one trillion, twelve billion, three hundred forty-one million, five hundred fifty-two thousand, five hundred twenty-three".