21902851241 has 2 divisors, whose sum is σ = 21902851242. Its totient is φ = 21902851240.

The previous prime is 21902851211. The next prime is 21902851277. The reversal of 21902851241 is 14215820912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20141286400 + 1761564841 = 141920^2 + 41971^2 .

It is a cyclic number.

It is not a de Polignac number, because 21902851241 - 2⁶ = 21902851177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21902851211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951425620 + 10951425621.

It is an arithmetic number, because the mean of its divisors is an integer number (10951425621).

Almost surely, 2^21902851241 is an apocalyptic number.

It is an amenable number.

21902851241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21902851241 is an equidigital number, since it uses as much as digits as its factorization.

21902851241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 21902851241 in words is "twenty-one billion, nine hundred two million, eight hundred fifty-one thousand, two hundred forty-one".