21612524005401 has 16 divisors (see below), whose sum is σ = 32933622344064. Its totient is φ = 12349919055744.

The previous prime is 21612524005349. The next prime is 21612524005403. The reversal of 21612524005401 is 10450042521612.

It is a happy number.

It is not a de Polignac number, because 21612524005401 - 2¹⁰ = 21612524004377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21612524005403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1091250 + ... + 6664523.

It is an arithmetic number, because the mean of its divisors is an integer number (2058351396504).

Almost surely, 2^{21612524005401} is an apocalyptic number.

21612524005401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21612524005401 is a deficient number, since it is larger than the sum of its proper divisors (11321098338663).

21612524005401 is a wasteful number, since it uses less digits than its factorization.

21612524005401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7888480.

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 21612524005401 in words is "twenty-one trillion, six hundred twelve billion, five hundred twenty-four million, five thousand, four hundred one".