21373540520361 has 16 divisors (see below), whose sum is σ = 30187720592064. Its totient is φ = 13404933200384.

The previous prime is 21373540520323. The next prime is 21373540520393. The reversal of 21373540520361 is 16302504537312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21373540520361 - 2¹¹ = 21373540518313 is a prime.

It is a super-3 number, since 3×21373540520361³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21373540540361) 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, 92316900 + ... + 92548133.

It is an arithmetic number, because the mean of its divisors is an integer number (1886732537004).

Almost surely, 2^{21373540520361} is an apocalyptic number.

It is an amenable number.

21373540520361 is a deficient number, since it is larger than the sum of its proper divisors (8814180071703).

21373540520361 is a wasteful number, since it uses less digits than its factorization.

21373540520361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184867320.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 21373540520361 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred forty million, five hundred twenty thousand, three hundred sixty-one".