221802023 has 2 divisors, whose sum is σ = 221802024. Its totient is φ = 221802022.

The previous prime is 221802019. The next prime is 221802073. The reversal of 221802023 is 320208122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221802023 - 2² = 221802019 is a prime.

It is a super-2 number, since 2×221802023² = 98392274813785058, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 221801986 and 221802004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221802073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110901011 + 110901012.

It is an arithmetic number, because the mean of its divisors is an integer number (110901012).

Almost surely, 2^221802023 is an apocalyptic number.

221802023 is a deficient number, since it is larger than the sum of its proper divisors (1).

221802023 is an equidigital number, since it uses as much as digits as its factorization.

221802023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 221802023 is about 14893.0192707859. The cubic root of 221802023 is about 605.3248470612.

The spelling of 221802023 in words is "two hundred twenty-one million, eight hundred two thousand, twenty-three".