21653420605315 has 16 divisors (see below), whose sum is σ = 26231012536320. Its totient is φ = 17158571992800.

The previous prime is 21653420605301. The next prime is 21653420605321. The reversal of 21653420605315 is 51350602435612.

It is not a de Polignac number, because 21653420605315 - 2²⁹ = 21652883734403 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27151261 + ... + 27937390.

It is an arithmetic number, because the mean of its divisors is an integer number (1639438283520).

Almost surely, 2^{21653420605315} is an apocalyptic number.

21653420605315 is a deficient number, since it is larger than the sum of its proper divisors (4577591931005).

21653420605315 is a wasteful number, since it uses less digits than its factorization.

21653420605315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55089402.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 21653420605315 in words is "twenty-one trillion, six hundred fifty-three billion, four hundred twenty million, six hundred five thousand, three hundred fifteen".