21612514604445 has 48 divisors (see below), whose sum is σ = 40101722107200. Its totient is φ = 10734922483200.

The previous prime is 21612514604423. The next prime is 21612514604491. The reversal of 21612514604445 is 54440641521612.

21612514604445 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 25 + 14 + 604 + 4 + 4 + 5 = 666.

It is not a de Polignac number, because 21612514604445 - 2²⁴ = 21612497827229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21612514604445.

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, 214168156 + ... + 214269045.

It is an arithmetic number, because the mean of its divisors is an integer number (835452543900).

Almost surely, 2^{21612514604445} is an apocalyptic number.

It is an amenable number.

21612514604445 is a deficient number, since it is larger than the sum of its proper divisors (18489207502755).

21612514604445 is a wasteful number, since it uses less digits than its factorization.

21612514604445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428437290 (or 428437287 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 21612514604445 in words is "twenty-one trillion, six hundred twelve billion, five hundred fourteen million, six hundred four thousand, four hundred forty-five".