21402103131 has 24 divisors (see below), whose sum is σ = 32762193984. Its totient is φ = 13416641280.

The previous prime is 21402103117. The next prime is 21402103169. The reversal of 21402103131 is 13130120412.

21402103131 is a `hidden beast` number, since 2 + 140 + 210 + 313 + 1 = 666.

It is not a de Polignac number, because 21402103131 - 2⁶ = 21402103067 is a prime.

It is a super-2 number, since 2×21402103131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21402103171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108286 + ... + 233516.

It is an arithmetic number, because the mean of its divisors is an integer number (1365091416).

Almost surely, 2^21402103131 is an apocalyptic number.

21402103131 is a deficient number, since it is larger than the sum of its proper divisors (11360090853).

21402103131 is a wasteful number, since it uses less digits than its factorization.

21402103131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126371 (or 126368 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21402103131 its reverse (13130120412), we get a palindrome (34532223543).

The spelling of 21402103131 in words is "twenty-one billion, four hundred two million, one hundred three thousand, one hundred thirty-one".