21998926337 has 2 divisors, whose sum is σ = 21998926338. Its totient is φ = 21998926336.

The previous prime is 21998926331. The next prime is 21998926373. The reversal of 21998926337 is 73362989912.

Together with next prime (21998926373) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11716763536 + 10282162801 = 108244^2 + 101401^2 .

It is a cyclic number.

It is not a de Polignac number, because 21998926337 - 2⁴ = 21998926321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21998926331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10999463168 + 10999463169.

It is an arithmetic number, because the mean of its divisors is an integer number (10999463169).

Almost surely, 2^21998926337 is an apocalyptic number.

It is an amenable number.

21998926337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21998926337 is an equidigital number, since it uses as much as digits as its factorization.

21998926337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 59.

The spelling of 21998926337 in words is "twenty-one billion, nine hundred ninety-eight million, nine hundred twenty-six thousand, three hundred thirty-seven".