21012110131 has 16 divisors (see below), whose sum is σ = 21997842048. Its totient is φ = 20049523200.

The previous prime is 21012110129. The next prime is 21012110159. The reversal of 21012110131 is 13101121012.

It is a happy number.

It is not a de Polignac number, because 21012110131 - 2¹ = 21012110129 is a prime.

It is a super-2 number, since 2×21012110131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012110111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3722071 + ... + 3727711.

It is an arithmetic number, because the mean of its divisors is an integer number (1374865128).

Almost surely, 2^21012110131 is an apocalyptic number.

21012110131 is a deficient number, since it is larger than the sum of its proper divisors (985731917).

21012110131 is a wasteful number, since it uses less digits than its factorization.

21012110131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21012110131 its reverse (13101121012), we get a palindrome (34113231143).

The spelling of 21012110131 in words is "twenty-one billion, twelve million, one hundred ten thousand, one hundred thirty-one".