21240310142431 has 8 divisors (see below), whose sum is σ = 21256669502720. Its totient is φ = 21223951316568.

The previous prime is 21240310142357. The next prime is 21240310142453. The reversal of 21240310142431 is 13424101304212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21240310142431 - 2³³ = 21231720207839 is a prime.

It is a super-2 number, since 2×21240310142431² (a number of 27 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 21240310142431.

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, 122139100 + ... + 122312878.

It is an arithmetic number, because the mean of its divisors is an integer number (2657083687840).

Almost surely, 2^{21240310142431} is an apocalyptic number.

21240310142431 is a deficient number, since it is larger than the sum of its proper divisors (16359360289).

21240310142431 is a wasteful number, since it uses less digits than its factorization.

21240310142431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267213.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21240310142431 its reverse (13424101304212), we get a palindrome (34664411446643).

The spelling of 21240310142431 in words is "twenty-one trillion, two hundred forty billion, three hundred ten million, one hundred forty-two thousand, four hundred thirty-one".