21740573231 has 16 divisors (see below), whose sum is σ = 24246401760. Its totient is φ = 19355306880.

The previous prime is 21740573221. The next prime is 21740573263. The reversal of 21740573231 is 13237504712.

It is a happy number.

It is not a de Polignac number, because 21740573231 - 2¹⁰ = 21740572207 is a prime.

It is a super-2 number, since 2×21740573231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21740573191 and 21740573200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740573221) 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, 324116 + ... + 385398.

It is an arithmetic number, because the mean of its divisors is an integer number (1515400110).

Almost surely, 2^21740573231 is an apocalyptic number.

21740573231 is a deficient number, since it is larger than the sum of its proper divisors (2505828529).

21740573231 is a wasteful number, since it uses less digits than its factorization.

21740573231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62266.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 21740573231 in words is "twenty-one billion, seven hundred forty million, five hundred seventy-three thousand, two hundred thirty-one".