21030400131 has 16 divisors (see below), whose sum is σ = 30203895456. Its totient is φ = 12939042816.

The previous prime is 21030400109. The next prime is 21030400133. The reversal of 21030400131 is 13100403012.

It is not a de Polignac number, because 21030400131 - 2¹⁴ = 21030383747 is a prime.

It is a super-2 number, since 2×21030400131² (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 21030400131.

It is not an unprimeable number, because it can be changed into a prime (21030400133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137731 + ... + 247043.

It is an arithmetic number, because the mean of its divisors is an integer number (1887743466).

Almost surely, 2^21030400131 is an apocalyptic number.

21030400131 is a deficient number, since it is larger than the sum of its proper divisors (9173495325).

21030400131 is a wasteful number, since it uses less digits than its factorization.

21030400131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114262.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21030400131 its reverse (13100403012), we get a palindrome (34130803143).

The spelling of 21030400131 in words is "twenty-one billion, thirty million, four hundred thousand, one hundred thirty-one".