21001210131 has 32 divisors (see below), whose sum is σ = 32370912000. Its totient is φ = 11977130880.

The previous prime is 21001210127. The next prime is 21001210133. The reversal of 21001210131 is 13101210012.

It is not a de Polignac number, because 21001210131 - 2² = 21001210127 is a prime.

It is a super-2 number, since 2×21001210131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21001210133) 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, 18976 + ... + 205821.

It is an arithmetic number, because the mean of its divisors is an integer number (1011591000).

Almost surely, 2^21001210131 is an apocalyptic number.

21001210131 is a deficient number, since it is larger than the sum of its proper divisors (11369701869).

21001210131 is a wasteful number, since it uses less digits than its factorization.

21001210131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224979.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21001210131 its reverse (13101210012), we get a palindrome (34102420143).

It can be divided in two parts, 21001 and 210131, that added together give a palindrome (231132).

The spelling of 21001210131 in words is "twenty-one billion, one million, two hundred ten thousand, one hundred thirty-one".