221279399023 has 2 divisors, whose sum is σ = 221279399024. Its totient is φ = 221279399022.

The previous prime is 221279398979. The next prime is 221279399119. The reversal of 221279399023 is 320993972122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221279399023 - 2²¹ = 221277301871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221279399323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110639699511 + 110639699512.

It is an arithmetic number, because the mean of its divisors is an integer number (110639699512).

Almost surely, 2^221279399023 is an apocalyptic number.

221279399023 is a deficient number, since it is larger than the sum of its proper divisors (1).

221279399023 is an equidigital number, since it uses as much as digits as its factorization.

221279399023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 221279399023 in words is "two hundred twenty-one billion, two hundred seventy-nine million, three hundred ninety-nine thousand, twenty-three".