21401525042 has 16 divisors (see below), whose sum is σ = 32263300512. Its totient is φ = 10647149280.

The previous prime is 21401525039. The next prime is 21401525081. The reversal of 21401525042 is 24052510412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782417 + ... + 809307.

It is an arithmetic number, because the mean of its divisors is an integer number (2016456282).

Almost surely, 2^21401525042 is an apocalyptic number.

21401525042 is a deficient number, since it is larger than the sum of its proper divisors (10861775470).

21401525042 is a wasteful number, since it uses less digits than its factorization.

21401525042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28873.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21401525042 in words is "twenty-one billion, four hundred one million, five hundred twenty-five thousand, forty-two".