21551014243983 has 16 divisors (see below), whose sum is σ = 32839919038976. Its totient is φ = 12314760924960.

The previous prime is 21551014243951. The next prime is 21551014243991. The reversal of 21551014243983 is 38934241015512.

It is not a de Polignac number, because 21551014243983 - 2⁵ = 21551014243951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21551014243933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775683 + ... + 6801108.

It is an arithmetic number, because the mean of its divisors is an integer number (2052494939936).

Almost surely, 2^{21551014243983} is an apocalyptic number.

21551014243983 is a deficient number, since it is larger than the sum of its proper divisors (11288904794993).

21551014243983 is a wasteful number, since it uses less digits than its factorization.

21551014243983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8696454.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 21551014243983 in words is "twenty-one trillion, five hundred fifty-one billion, fourteen million, two hundred forty-three thousand, nine hundred eighty-three".