21373602514634 has 4 divisors (see below), whose sum is σ = 32060403771954. Its totient is φ = 10686801257316.

The previous prime is 21373602514633. The next prime is 21373602514697. The reversal of 21373602514634 is 43641520637312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21373562154025 + 40360609 = 4623155^2 + 6353^2 .

It is not an unprimeable number, because it can be changed into a prime (21373602514631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5343400628657 + ... + 5343400628660.

Almost surely, 2^{21373602514634} is an apocalyptic number.

21373602514634 is a deficient number, since it is larger than the sum of its proper divisors (10686801257320).

21373602514634 is a wasteful number, since it uses less digits than its factorization.

21373602514634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10686801257319.

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 21373602514634 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred two million, five hundred fourteen thousand, six hundred thirty-four".