21125122014 has 16 divisors (see below), whose sum is σ = 42375619728. Its totient is φ = 7020811392.

The previous prime is 21125121973. The next prime is 21125122021. The reversal of 21125122014 is 41022152112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5221797 + ... + 5225840.

It is an arithmetic number, because the mean of its divisors is an integer number (2648476233).

Almost surely, 2^21125122014 is an apocalyptic number.

21125122014 is an abundant number, since it is smaller than the sum of its proper divisors (21250497714).

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

21125122014 is a wasteful number, since it uses less digits than its factorization.

21125122014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10447979.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21125122014 its reverse (41022152112), we get a palindrome (62147274126).

The spelling of 21125122014 in words is "twenty-one billion, one hundred twenty-five million, one hundred twenty-two thousand, fourteen".