21270749131 has 8 divisors (see below), whose sum is σ = 21659019200. Its totient is φ = 20885454720.

The previous prime is 21270749113. The next prime is 21270749167. The reversal of 21270749131 is 13194707212.

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 21270749131 - 2²¹ = 21268651979 is a prime.

It is a super-2 number, since 2×21270749131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21270749431) 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, 729486 + ... + 758083.

It is an arithmetic number, because the mean of its divisors is an integer number (2707377400).

Almost surely, 2^21270749131 is an apocalyptic number.

21270749131 is a deficient number, since it is larger than the sum of its proper divisors (388270069).

21270749131 is a wasteful number, since it uses less digits than its factorization.

21270749131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487829.

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 21270749131 in words is "twenty-one billion, two hundred seventy million, seven hundred forty-nine thousand, one hundred thirty-one".