21102202019973 has 16 divisors (see below), whose sum is σ = 28504586589696. Its totient is φ = 13884325184880.

The previous prime is 21102202019923. The next prime is 21102202020007. The reversal of 21102202019973 is 37991020220112.

It is a happy number.

It is not a de Polignac number, because 21102202019973 - 2⁴⁰ = 20002690392197 is a prime.

It is a super-2 number, since 2×21102202019973² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102202019903) 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, 43397665 + ... + 43881222.

It is an arithmetic number, because the mean of its divisors is an integer number (1781536661856).

Almost surely, 2^{21102202019973} is an apocalyptic number.

It is an amenable number.

21102202019973 is a deficient number, since it is larger than the sum of its proper divisors (7402384569723).

21102202019973 is an equidigital number, since it uses as much as digits as its factorization.

21102202019973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87279944.

The product of its (nonzero) digits is 27216, while the sum is 39.

The spelling of 21102202019973 in words is "twenty-one trillion, one hundred two billion, two hundred two million, nineteen thousand, nine hundred seventy-three".