21252635134 has 4 divisors (see below), whose sum is σ = 31878952704. Its totient is φ = 10626317566.

The previous prime is 21252635113. The next prime is 21252635141. The reversal of 21252635134 is 43153625212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21252635134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313158782 + ... + 5313158785.

It is an arithmetic number, because the mean of its divisors is an integer number (7969738176).

Almost surely, 2^21252635134 is an apocalyptic number.

21252635134 is a deficient number, since it is larger than the sum of its proper divisors (10626317570).

21252635134 is a wasteful number, since it uses less digits than its factorization.

21252635134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10626317569.

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

The spelling of 21252635134 in words is "twenty-one billion, two hundred fifty-two million, six hundred thirty-five thousand, one hundred thirty-four".