21111202071983 has 16 divisors (see below), whose sum is σ = 22514327136000. Its totient is φ = 19726004134272.

The previous prime is 21111202071977. The next prime is 21111202072021. The reversal of 21111202071983 is 38917020211112.

It is a cyclic number.

It is not a de Polignac number, because 21111202071983 - 2¹⁴ = 21111202055599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111202071383) 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, 220275848 + ... + 220371666.

It is an arithmetic number, because the mean of its divisors is an integer number (1407145446000).

Almost surely, 2^{21111202071983} is an apocalyptic number.

21111202071983 is a deficient number, since it is larger than the sum of its proper divisors (1403125064017).

21111202071983 is a wasteful number, since it uses less digits than its factorization.

21111202071983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189214.

The product of its (nonzero) digits is 12096, while the sum is 38.

The spelling of 21111202071983 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, seventy-one thousand, nine hundred eighty-three".