21360640121364 has 48 divisors (see below), whose sum is σ = 49872578394240. Its totient is φ = 7115774023680.

The previous prime is 21360640121357. The next prime is 21360640121377. The reversal of 21360640121364 is 46312104606312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133699249 + ... + 133858919.

It is an arithmetic number, because the mean of its divisors is an integer number (1039012049880).

Almost surely, 2^{21360640121364} is an apocalyptic number.

It is an amenable number.

21360640121364 is an abundant number, since it is smaller than the sum of its proper divisors (28511938272876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21360640121364 is a wasteful number, since it uses less digits than its factorization.

21360640121364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166560 (or 166558 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

Adding to 21360640121364 its reverse (46312104606312), we get a palindrome (67672744727676).

The spelling of 21360640121364 in words is "twenty-one trillion, three hundred sixty billion, six hundred forty million, one hundred twenty-one thousand, three hundred sixty-four".