21140025134 has 8 divisors (see below), whose sum is σ = 32092086600. Its totient is φ = 10442662936.

The previous prime is 21140025133. The next prime is 21140025187. The reversal of 21140025134 is 43152004112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140025133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63674609 + ... + 63674940.

It is an arithmetic number, because the mean of its divisors is an integer number (4011510825).

Almost surely, 2^21140025134 is an apocalyptic number.

21140025134 is a deficient number, since it is larger than the sum of its proper divisors (10952061466).

21140025134 is a wasteful number, since it uses less digits than its factorization.

21140025134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127349634.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21140025134 its reverse (43152004112), we get a palindrome (64292029246).

The spelling of 21140025134 in words is "twenty-one billion, one hundred forty million, twenty-five thousand, one hundred thirty-four".