222902021 has 2 divisors, whose sum is σ = 222902022. Its totient is φ = 222902020.

The previous prime is 222902003. The next prime is 222902041. The reversal of 222902021 is 120209222.

It is an a-pointer prime, because the next prime (222902041) can be obtained adding 222902021 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213568996 + 9333025 = 14614^2 + 3055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222902021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222901984 and 222902002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222902041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111451010 + 111451011.

It is an arithmetic number, because the mean of its divisors is an integer number (111451011).

Almost surely, 2^222902021 is an apocalyptic number.

It is an amenable number.

222902021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222902021 is an equidigital number, since it uses as much as digits as its factorization.

222902021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 222902021 is about 14929.9035830778. The cubic root of 222902021 is about 606.3238737201.

The spelling of 222902021 in words is "two hundred twenty-two million, nine hundred two thousand, twenty-one".