21292237827 has 32 divisors (see below), whose sum is σ = 36057192960. Its totient is φ = 12164683680.

The previous prime is 21292237823. The next prime is 21292237829. The reversal of 21292237827 is 72873229212.

It is not a de Polignac number, because 21292237827 - 2² = 21292237823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21292237823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1771177 + ... + 1783157.

It is an arithmetic number, because the mean of its divisors is an integer number (1126787280).

Almost surely, 2^21292237827 is an apocalyptic number.

21292237827 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21292237827 is a deficient number, since it is larger than the sum of its proper divisors (14764955133).

21292237827 is a wasteful number, since it uses less digits than its factorization.

21292237827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21400 (or 21394 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The spelling of 21292237827 in words is "twenty-one billion, two hundred ninety-two million, two hundred thirty-seven thousand, eight hundred twenty-seven".