21583874330377 has 2 divisors, whose sum is σ = 21583874330378. Its totient is φ = 21583874330376.

The previous prime is 21583874330351. The next prime is 21583874330419. The reversal of 21583874330377 is 77303347838512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15890396348176 + 5693477982201 = 3986276^2 + 2386101^2 .

It is a cyclic number.

It is not a de Polignac number, because 21583874330377 - 2²³ = 21583865941769 is a prime.

It is a super-2 number, since 2×21583874330377² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21583874300377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10791937165188 + 10791937165189.

It is an arithmetic number, because the mean of its divisors is an integer number (10791937165189).

Almost surely, 2^{21583874330377} is an apocalyptic number.

It is an amenable number.

21583874330377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21583874330377 is an equidigital number, since it uses as much as digits as its factorization.

21583874330377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71124480, while the sum is 61.

The spelling of 21583874330377 in words is "twenty-one trillion, five hundred eighty-three billion, eight hundred seventy-four million, three hundred thirty thousand, three hundred seventy-seven".