21282241891 has 2 divisors, whose sum is σ = 21282241892. Its totient is φ = 21282241890.

The previous prime is 21282241859. The next prime is 21282241901. The reversal of 21282241891 is 19814228212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21282241891 - 2⁵ = 21282241859 is a prime.

It is not a weakly prime, because it can be changed into another prime (21282241801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641120945 + 10641120946.

It is an arithmetic number, because the mean of its divisors is an integer number (10641120946).

Almost surely, 2^21282241891 is an apocalyptic number.

21282241891 is a deficient number, since it is larger than the sum of its proper divisors (1).

21282241891 is an equidigital number, since it uses as much as digits as its factorization.

21282241891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 40.

The spelling of 21282241891 in words is "twenty-one billion, two hundred eighty-two million, two hundred forty-one thousand, eight hundred ninety-one".