21838990571 has 2 divisors, whose sum is σ = 21838990572. Its totient is φ = 21838990570.

The previous prime is 21838990553. The next prime is 21838990573. The reversal of 21838990571 is 17509983812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21838990571 - 2¹⁰ = 21838989547 is a prime.

Together with 21838990573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21838990573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919495285 + 10919495286.

It is an arithmetic number, because the mean of its divisors is an integer number (10919495286).

Almost surely, 2^21838990571 is an apocalyptic number.

21838990571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21838990571 is an equidigital number, since it uses as much as digits as its factorization.

21838990571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 21838990571 in words is "twenty-one billion, eight hundred thirty-eight million, nine hundred ninety thousand, five hundred seventy-one".