21737064264673 has 4 divisors (see below), whose sum is σ = 21737098721988. Its totient is φ = 21737029807360.

The previous prime is 21737064264637. The next prime is 21737064264677. The reversal of 21737064264673 is 37646246073712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12813987193569 + 8923077071104 = 3579663^2 + 2987152^2 .

It is a cyclic number.

It is not a de Polignac number, because 21737064264673 - 2¹⁷ = 21737064133601 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21737064264677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16264408 + ... + 17550073.

It is an arithmetic number, because the mean of its divisors is an integer number (5434274680497).

Almost surely, 2^{21737064264673} is an apocalyptic number.

It is an amenable number.

21737064264673 is a deficient number, since it is larger than the sum of its proper divisors (34457315).

21737064264673 is an equidigital number, since it uses as much as digits as its factorization.

21737064264673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34457314.

The product of its (nonzero) digits is 42674688, while the sum is 58.

The spelling of 21737064264673 in words is "twenty-one trillion, seven hundred thirty-seven billion, sixty-four million, two hundred sixty-four thousand, six hundred seventy-three".