11898277021 has 2 divisors, whose sum is σ = 11898277022. Its totient is φ = 11898277020.

The previous prime is 11898277019. The next prime is 11898277037. The reversal of 11898277021 is 12077289811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11878820100 + 19456921 = 108990^2 + 4411^2 .

It is a cyclic number.

It is not a de Polignac number, because 11898277021 - 2¹ = 11898277019 is a prime.

Together with 11898277019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11898227021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5949138510 + 5949138511.

It is an arithmetic number, because the mean of its divisors is an integer number (5949138511).

Almost surely, 2^11898277021 is an apocalyptic number.

It is an amenable number.

11898277021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11898277021 is an equidigital number, since it uses as much as digits as its factorization.

11898277021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 46.

The spelling of 11898277021 in words is "eleven billion, eight hundred ninety-eight million, two hundred seventy-seven thousand, twenty-one".