21301021131 has 32 divisors (see below), whose sum is σ = 32421731328. Its totient is φ = 12323351040.

The previous prime is 21301021117. The next prime is 21301021139. The reversal of 21301021131 is 13112010312.

It is a happy number.

It is not a de Polignac number, because 21301021131 - 2¹⁵ = 21300988363 is a prime.

It is a super-2 number, since 2×21301021131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21301021131.

It is not an unprimeable number, because it can be changed into a prime (21301021139) 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, 586360 + ... + 621626.

It is an arithmetic number, because the mean of its divisors is an integer number (1013179104).

Almost surely, 2^21301021131 is an apocalyptic number.

21301021131 is a deficient number, since it is larger than the sum of its proper divisors (11120710197).

21301021131 is a wasteful number, since it uses less digits than its factorization.

21301021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36211.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21301021131 its reverse (13112010312), we get a palindrome (34413031443).

The spelling of 21301021131 in words is "twenty-one billion, three hundred one million, twenty-one thousand, one hundred thirty-one".