21000335134 has 4 divisors (see below), whose sum is σ = 31500502704. Its totient is φ = 10500167566.

The previous prime is 21000335119. The next prime is 21000335149. The reversal of 21000335134 is 43153300012.

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

It is an interprime number because it is at equal distance from previous prime (21000335119) and next prime (21000335149).

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, 5250083782 + ... + 5250083785.

It is an arithmetic number, because the mean of its divisors is an integer number (7875125676).

Almost surely, 2^21000335134 is an apocalyptic number.

21000335134 is a deficient number, since it is larger than the sum of its proper divisors (10500167570).

21000335134 is a wasteful number, since it uses less digits than its factorization.

21000335134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500167569.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21000335134 its reverse (43153300012), we get a palindrome (64153635146).

The spelling of 21000335134 in words is "twenty-one billion, three hundred thirty-five thousand, one hundred thirty-four".