21051025134 has 16 divisors (see below), whose sum is σ = 42103471872. Its totient is φ = 7016771448.

The previous prime is 21051025133. The next prime is 21051025141. The reversal of 21051025134 is 43152015012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051025133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324417 + ... + 383859.

It is an arithmetic number, because the mean of its divisors is an integer number (2631466992).

Almost surely, 2^21051025134 is an apocalyptic number.

21051025134 is an abundant number, since it is smaller than the sum of its proper divisors (21052446738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21051025134 is a wasteful number, since it uses less digits than its factorization.

21051025134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118471.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21051025134 in words is "twenty-one billion, fifty-one million, twenty-five thousand, one hundred thirty-four".