21725305753477 has 4 divisors (see below), whose sum is σ = 21725455255840. Its totient is φ = 21725156251116.

The previous prime is 21725305753469. The next prime is 21725305753517. The reversal of 21725305753477 is 77435750352712.

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 21725305753477 - 2³ = 21725305753469 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 (21725305753457) 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, 74532993 + ... + 74823910.

It is an arithmetic number, because the mean of its divisors is an integer number (5431363813960).

Almost surely, 2^{21725305753477} is an apocalyptic number.

It is an amenable number.

21725305753477 is a deficient number, since it is larger than the sum of its proper divisors (149502363).

21725305753477 is a wasteful number, since it uses less digits than its factorization.

21725305753477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149502362.

The product of its (nonzero) digits is 43218000, while the sum is 58.

The spelling of 21725305753477 in words is "twenty-one trillion, seven hundred twenty-five billion, three hundred five million, seven hundred fifty-three thousand, four hundred seventy-seven".