21342430131 has 16 divisors (see below), whose sum is σ = 31095216768. Its totient is φ = 12913272000.

The previous prime is 21342430127. The next prime is 21342430189. The reversal of 21342430131 is 13103424312.

It is a happy number.

It is not a de Polignac number, because 21342430131 - 2² = 21342430127 is a prime.

It is a super-2 number, since 2×21342430131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21342430121) 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, 518221 + ... + 557886.

It is an arithmetic number, because the mean of its divisors is an integer number (1943451048).

Almost surely, 2^21342430131 is an apocalyptic number.

21342430131 is a deficient number, since it is larger than the sum of its proper divisors (9752786637).

21342430131 is a wasteful number, since it uses less digits than its factorization.

21342430131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076722.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21342430131 its reverse (13103424312), we get a palindrome (34445854443).

The spelling of 21342430131 in words is "twenty-one billion, three hundred forty-two million, four hundred thirty thousand, one hundred thirty-one".