21434502131 has 12 divisors (see below), whose sum is σ = 25101363600. Its totient is φ = 18249119280.

The previous prime is 21434502113. The next prime is 21434502149. The reversal of 21434502131 is 13120543412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21434502113) and next prime (21434502149).

It is a de Polignac number, because none of the positive numbers 2^k-21434502131 is a prime.

It is a super-2 number, since 2×21434502131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21434502131.

It is not an unprimeable number, because it can be changed into a prime (21434502191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1460615 + ... + 1475216.

It is an arithmetic number, because the mean of its divisors is an integer number (2091780300).

Almost surely, 2^21434502131 is an apocalyptic number.

21434502131 is a deficient number, since it is larger than the sum of its proper divisors (3666861469).

21434502131 is a wasteful number, since it uses less digits than its factorization.

21434502131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935994 (or 2935987 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 21434502131 in words is "twenty-one billion, four hundred thirty-four million, five hundred two thousand, one hundred thirty-one".