21421512044 has 12 divisors (see below), whose sum is σ = 38285255904. Its totient is φ = 10482867504.

The previous prime is 21421512043. The next prime is 21421512061. The reversal of 21421512044 is 44021512412.

It is not an unprimeable number, because it can be changed into a prime (21421512043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 56971919 + ... + 56972294.

It is an arithmetic number, because the mean of its divisors is an integer number (3190437992).

Almost surely, 2^21421512044 is an apocalyptic number.

It is an amenable number.

21421512044 is a deficient number, since it is larger than the sum of its proper divisors (16863743860).

21421512044 is a wasteful number, since it uses less digits than its factorization.

21421512044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113944264 (or 113944262 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The spelling of 21421512044 in words is "twenty-one billion, four hundred twenty-one million, five hundred twelve thousand, forty-four".