21540430462 has 8 divisors (see below), whose sum is σ = 32314350816. Its totient is φ = 10768980192.

The previous prime is 21540430459. The next prime is 21540430523. The reversal of 21540430462 is 26403404512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595563 + ... + 630694.

It is an arithmetic number, because the mean of its divisors is an integer number (4039293852).

Almost surely, 2^21540430462 is an apocalyptic number.

21540430462 is a deficient number, since it is larger than the sum of its proper divisors (10773920354).

21540430462 is a wasteful number, since it uses less digits than its factorization.

21540430462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235042.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 21540430462 its reverse (26403404512), we get a palindrome (47943834974).

The spelling of 21540430462 in words is "twenty-one billion, five hundred forty million, four hundred thirty thousand, four hundred sixty-two".