21365025157445 has 8 divisors (see below), whose sum is σ = 25833740343840. Its totient is φ = 16961546689360.

The previous prime is 21365025157423. The next prime is 21365025157523. The reversal of 21365025157445 is 54475152056312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21365025157445 - 2³⁴ = 21347845288261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21365025157393 and 21365025157402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16309178855 + ... + 16309180164.

It is an arithmetic number, because the mean of its divisors is an integer number (3229217542980).

Almost surely, 2^{21365025157445} is an apocalyptic number.

It is an amenable number.

21365025157445 is a deficient number, since it is larger than the sum of its proper divisors (4468715186395).

21365025157445 is a wasteful number, since it uses less digits than its factorization.

21365025157445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32618359155.

The product of its (nonzero) digits is 5040000, while the sum is 50.

The spelling of 21365025157445 in words is "twenty-one trillion, three hundred sixty-five billion, twenty-five million, one hundred fifty-seven thousand, four hundred forty-five".