21390022853 has 2 divisors, whose sum is σ = 21390022854. Its totient is φ = 21390022852.

The previous prime is 21390022831. The next prime is 21390022873. The reversal of 21390022853 is 35822009312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20788449124 + 601573729 = 144182^2 + 24527^2 .

It is a cyclic number.

It is not a de Polignac number, because 21390022853 - 2⁶ = 21390022789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21390022873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10695011426 + 10695011427.

It is an arithmetic number, because the mean of its divisors is an integer number (10695011427).

Almost surely, 2^21390022853 is an apocalyptic number.

It is an amenable number.

21390022853 is a deficient number, since it is larger than the sum of its proper divisors (1).

21390022853 is an equidigital number, since it uses as much as digits as its factorization.

21390022853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21390022853 in words is "twenty-one billion, three hundred ninety million, twenty-two thousand, eight hundred fifty-three".