21973547635201 has 4 divisors (see below), whose sum is σ = 21973714557952. Its totient is φ = 21973380712452.

The previous prime is 21973547635157. The next prime is 21973547635213. The reversal of 21973547635201 is 10253674537912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21973547635201 - 2³¹ = 21971400151553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21973547635271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83263761 + ... + 83527246.

It is an arithmetic number, because the mean of its divisors is an integer number (5493428639488).

Almost surely, 2^{21973547635201} is an apocalyptic number.

It is an amenable number.

21973547635201 is a deficient number, since it is larger than the sum of its proper divisors (166922751).

21973547635201 is a wasteful number, since it uses less digits than its factorization.

21973547635201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166922750.

The product of its (nonzero) digits is 9525600, while the sum is 55.

The spelling of 21973547635201 in words is "twenty-one trillion, nine hundred seventy-three billion, five hundred forty-seven million, six hundred thirty-five thousand, two hundred one".