21131230342 has 16 divisors (see below), whose sum is σ = 34178886000. Its totient is φ = 9765394560.

The previous prime is 21131230303. The next prime is 21131230363. The reversal of 21131230342 is 24303213112.

It is a super-2 number, since 2×21131230342² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6779967 + ... + 6783082.

It is an arithmetic number, because the mean of its divisors is an integer number (2136180375).

Almost surely, 2^21131230342 is an apocalyptic number.

21131230342 is a deficient number, since it is larger than the sum of its proper divisors (13047655658).

21131230342 is a wasteful number, since it uses less digits than its factorization.

21131230342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13563111.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21131230342 its reverse (24303213112), we get a palindrome (45434443454).

The spelling of 21131230342 in words is "twenty-one billion, one hundred thirty-one million, two hundred thirty thousand, three hundred forty-two".