21365516646105 has 8 divisors (see below), whose sum is σ = 34184826633792. Its totient is φ = 11394942211248.

The previous prime is 21365516646031. The next prime is 21365516646157. The reversal of 21365516646105 is 50164661556312.

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

It is not a de Polignac number, because 21365516646105 - 2²⁶ = 21365449537241 is a prime.

It is a super-3 number, since 3×21365516646105³ (a number of 41 digits) contains 333 as substring.

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, 712183888189 + ... + 712183888218.

It is an arithmetic number, because the mean of its divisors is an integer number (4273103329224).

Almost surely, 2^{21365516646105} is an apocalyptic number.

It is an amenable number.

21365516646105 is a deficient number, since it is larger than the sum of its proper divisors (12819309987687).

21365516646105 is a wasteful number, since it uses less digits than its factorization.

21365516646105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424367776415.

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 21365516646105 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixteen million, six hundred forty-six thousand, one hundred five".