220672021 has 2 divisors, whose sum is σ = 220672022. Its totient is φ = 220672020.

The previous prime is 220672013. The next prime is 220672027. The reversal of 220672021 is 120276022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220195921 + 476100 = 14839^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 220672021 - 2³ = 220672013 is a prime.

It is a super-2 number, since 2×220672021² = 97392281704448882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220671983 and 220672001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220672027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110336010 + 110336011.

It is an arithmetic number, because the mean of its divisors is an integer number (110336011).

Almost surely, 2^220672021 is an apocalyptic number.

It is an amenable number.

220672021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220672021 is an equidigital number, since it uses as much as digits as its factorization.

220672021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 220672021 is about 14855.0335240281. The cubic root of 220672021 is about 604.2951251692.

The spelling of 220672021 in words is "two hundred twenty million, six hundred seventy-two thousand, twenty-one".