21373577505464 has 8 divisors (see below), whose sum is σ = 40075457822760. Its totient is φ = 10686788752728.

The previous prime is 21373577505461. The next prime is 21373577505487. The reversal of 21373577505464 is 46450577537312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373577505461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335848594084 + ... + 1335848594099.

It is an arithmetic number, because the mean of its divisors is an integer number (5009432227845).

Almost surely, 2^{21373577505464} is an apocalyptic number.

It is an amenable number.

21373577505464 is a deficient number, since it is larger than the sum of its proper divisors (18701880317296).

21373577505464 is a wasteful number, since it uses less digits than its factorization.

21373577505464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671697188189 (or 2671697188185 counting only the distinct ones).

The product of its (nonzero) digits is 74088000, while the sum is 59.

The spelling of 21373577505464 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred seventy-seven million, five hundred five thousand, four hundred sixty-four".