21231725277 has 16 divisors (see below), whose sum is σ = 32742904320. Its totient is φ = 11986239792.

The previous prime is 21231725267. The next prime is 21231725329. The reversal of 21231725277 is 77252713212.

It is not a de Polignac number, because 21231725277 - 2²³ = 21223336669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231725267) 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, 6088827 + ... + 6092312.

It is an arithmetic number, because the mean of its divisors is an integer number (2046431520).

Almost surely, 2^21231725277 is an apocalyptic number.

It is an amenable number.

21231725277 is a deficient number, since it is larger than the sum of its proper divisors (11511179043).

21231725277 is a wasteful number, since it uses less digits than its factorization.

21231725277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12181232.

The product of its digits is 82320, while the sum is 39.

The spelling of 21231725277 in words is "twenty-one billion, two hundred thirty-one million, seven hundred twenty-five thousand, two hundred seventy-seven".