21253236145366 has 8 divisors (see below), whose sum is σ = 32070751549200. Its totient is φ = 10562985628968.

The previous prime is 21253236145319. The next prime is 21253236145399. The reversal of 21253236145366 is 66354163235212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31816221441 + ... + 31816222108.

It is an arithmetic number, because the mean of its divisors is an integer number (4008843943650).

Almost surely, 2^{21253236145366} is an apocalyptic number.

21253236145366 is a deficient number, since it is larger than the sum of its proper divisors (10817515403834).

21253236145366 is a wasteful number, since it uses less digits than its factorization.

21253236145366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63632443718.

The product of its digits is 4665600, while the sum is 49.

The spelling of 21253236145366 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-six million, one hundred forty-five thousand, three hundred sixty-six".