21513501423430 has 32 divisors (see below), whose sum is σ = 40092540697440. Its totient is φ = 8301835315200.

The previous prime is 21513501423341. The next prime is 21513501423481. The reversal of 21513501423430 is 3432410531512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30125496 + ... + 30831355.

It is an arithmetic number, because the mean of its divisors is an integer number (1252891896795).

Almost surely, 2^{21513501423430} is an apocalyptic number.

21513501423430 is a deficient number, since it is larger than the sum of its proper divisors (18579039274010).

21513501423430 is a wasteful number, since it uses less digits than its factorization.

21513501423430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60958104.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21513501423430 its reverse (3432410531512), we get a palindrome (24945911954942).

The spelling of 21513501423430 in words is "twenty-one trillion, five hundred thirteen billion, five hundred one million, four hundred twenty-three thousand, four hundred thirty".