21402142131 has 16 divisors (see below), whose sum is σ = 28631167488. Its totient is φ = 14220679200.

The previous prime is 21402142103. The next prime is 21402142133. The reversal of 21402142131 is 13124120412.

It is not a de Polignac number, because 21402142131 - 2⁶ = 21402142067 is a prime.

It is a super-2 number, since 2×21402142131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21402142098 and 21402142107.

It is not an unprimeable number, because it can be changed into a prime (21402142133) 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, 1251420 + ... + 1268406.

It is an arithmetic number, because the mean of its divisors is an integer number (1789447968).

Almost surely, 2^21402142131 is an apocalyptic number.

21402142131 is a deficient number, since it is larger than the sum of its proper divisors (7229025357).

21402142131 is a wasteful number, since it uses less digits than its factorization.

21402142131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18362.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21402142131 its reverse (13124120412), we get a palindrome (34526262543).

The spelling of 21402142131 in words is "twenty-one billion, four hundred two million, one hundred forty-two thousand, one hundred thirty-one".