21389129134 has 4 divisors (see below), whose sum is σ = 32083693704. Its totient is φ = 10694564566.

The previous prime is 21389129119. The next prime is 21389129143. The reversal of 21389129134 is 43192198312.

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

It is a super-2 number, since 2×21389129134² (a number of 21 digits) contains 22 as substring.

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, 5347282282 + ... + 5347282285.

It is an arithmetic number, because the mean of its divisors is an integer number (8020923426).

Almost surely, 2^21389129134 is an apocalyptic number.

21389129134 is a deficient number, since it is larger than the sum of its proper divisors (10694564570).

21389129134 is a wasteful number, since it uses less digits than its factorization.

21389129134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10694564569.

The product of its digits is 93312, while the sum is 43.

The spelling of 21389129134 in words is "twenty-one billion, three hundred eighty-nine million, one hundred twenty-nine thousand, one hundred thirty-four".