21883739157521 has 2 divisors, whose sum is σ = 21883739157522. Its totient is φ = 21883739157520.

The previous prime is 21883739157463. The next prime is 21883739157559. The reversal of 21883739157521 is 12575193738812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21591923117521 + 291816040000 = 4646711^2 + 540200^2 .

It is a cyclic number.

It is not a de Polignac number, because 21883739157521 - 2¹⁴ = 21883739141137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21883739147521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10941869578760 + 10941869578761.

It is an arithmetic number, because the mean of its divisors is an integer number (10941869578761).

Almost surely, 2^{21883739157521} is an apocalyptic number.

It is an amenable number.

21883739157521 is a deficient number, since it is larger than the sum of its proper divisors (1).

21883739157521 is an equidigital number, since it uses as much as digits as its factorization.

21883739157521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 62.

The spelling of 21883739157521 in words is "twenty-one trillion, eight hundred eighty-three billion, seven hundred thirty-nine million, one hundred fifty-seven thousand, five hundred twenty-one".