21365633052671 has 16 divisors (see below), whose sum is σ = 22091170694400. Its totient is φ = 20642371276800.

The previous prime is 21365633052667. The next prime is 21365633052679. The reversal of 21365633052671 is 17625033656312.

It is a cyclic number.

It is not a de Polignac number, because 21365633052671 - 2² = 21365633052667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365633052679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267602585 + ... + 267682413.

It is an arithmetic number, because the mean of its divisors is an integer number (1380698168400).

Almost surely, 2^{21365633052671} is an apocalyptic number.

21365633052671 is a deficient number, since it is larger than the sum of its proper divisors (725537641729).

21365633052671 is a wasteful number, since it uses less digits than its factorization.

21365633052671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93970.

The product of its (nonzero) digits is 4082400, while the sum is 50.

The spelling of 21365633052671 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred thirty-three million, fifty-two thousand, six hundred seventy-one".