21874059257 has 2 divisors, whose sum is σ = 21874059258. Its totient is φ = 21874059256.

The previous prime is 21874059241. The next prime is 21874059323. The reversal of 21874059257 is 75295047812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21389355001 + 484704256 = 146251^2 + 22016^2 .

It is a cyclic number.

It is not a de Polignac number, because 21874059257 - 2⁴ = 21874059241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21874059157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937029628 + 10937029629.

It is an arithmetic number, because the mean of its divisors is an integer number (10937029629).

Almost surely, 2^21874059257 is an apocalyptic number.

It is an amenable number.

21874059257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21874059257 is an equidigital number, since it uses as much as digits as its factorization.

21874059257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 21874059257 in words is "twenty-one billion, eight hundred seventy-four million, fifty-nine thousand, two hundred fifty-seven".