21275630231 has 8 divisors (see below), whose sum is σ = 21407078880. Its totient is φ = 21144418848.

The previous prime is 21275630219. The next prime is 21275630249. The reversal of 21275630231 is 13203657212.

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

It is a cyclic number.

It is not a de Polignac number, because 21275630231 - 2¹⁸ = 21275368087 is a prime.

It is a super-2 number, since 2×21275630231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275633231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122285 + ... + 239801.

It is an arithmetic number, because the mean of its divisors is an integer number (2675884860).

Almost surely, 2^21275630231 is an apocalyptic number.

21275630231 is a deficient number, since it is larger than the sum of its proper divisors (131448649).

21275630231 is a wasteful number, since it uses less digits than its factorization.

21275630231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118633.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21275630231 in words is "twenty-one billion, two hundred seventy-five million, six hundred thirty thousand, two hundred thirty-one".