21354612716764 has 48 divisors (see below), whose sum is σ = 40120926995520. Its totient is φ = 9920465026560.

The previous prime is 21354612716761. The next prime is 21354612716803. The reversal of 21354612716764 is 46761721645312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354612716761) 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, 11497239 + ... + 13224814.

It is an arithmetic number, because the mean of its divisors is an integer number (835852645740).

Almost surely, 2^{21354612716764} is an apocalyptic number.

It is an amenable number.

21354612716764 is a deficient number, since it is larger than the sum of its proper divisors (18766314278756).

21354612716764 is a wasteful number, since it uses less digits than its factorization.

21354612716764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24722350 (or 24722348 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 55.

The spelling of 21354612716764 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred twelve million, seven hundred sixteen thousand, seven hundred sixty-four".