21930413857373 has 6 divisors (see below), whose sum is σ = 25510889589246. Its totient is φ = 18797497591992.

The previous prime is 21930413857343. The next prime is 21930413857381. The reversal of 21930413857373 is 37375831403912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19262460765604 + 2667953091769 = 4388902^2 + 1633387^2 .

It is not a de Polignac number, because 21930413857373 - 2¹⁰ = 21930413856349 is a prime.

It is a super-2 number, since 2×21930413857373² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930413857343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223779733190 + ... + 223779733287.

It is an arithmetic number, because the mean of its divisors is an integer number (4251814931541).

Almost surely, 2^{21930413857373} is an apocalyptic number.

It is an amenable number.

21930413857373 is a deficient number, since it is larger than the sum of its proper divisors (3580475731873).

21930413857373 is an equidigital number, since it uses as much as digits as its factorization.

21930413857373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447559466491 (or 447559466484 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 21930413857373 in words is "twenty-one trillion, nine hundred thirty billion, four hundred thirteen million, eight hundred fifty-seven thousand, three hundred seventy-three".