21400222091 has 2 divisors, whose sum is σ = 21400222092. Its totient is φ = 21400222090.

The previous prime is 21400222049. The next prime is 21400222127. The reversal of 21400222091 is 19022200412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21400222091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21400222001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700111045 + 10700111046.

It is an arithmetic number, because the mean of its divisors is an integer number (10700111046).

Almost surely, 2^21400222091 is an apocalyptic number.

21400222091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400222091 is an equidigital number, since it uses as much as digits as its factorization.

21400222091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21400222091 in words is "twenty-one billion, four hundred million, two hundred twenty-two thousand, ninety-one".