84920221 has 2 divisors, whose sum is σ = 84920222. Its totient is φ = 84920220.

The previous prime is 84920203. The next prime is 84920233. The reversal of 84920221 is 12202948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51984100 + 32936121 = 7210^2 + 5739^2 .

It is a cyclic number.

It is not a de Polignac number, because 84920221 - 2¹⁹ = 84395933 is a prime.

It is a super-2 number, since 2×84920221² = 14422887869377682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84920221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84920281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42460110 + 42460111.

It is an arithmetic number, because the mean of its divisors is an integer number (42460111).

Almost surely, 2^84920221 is an apocalyptic number.

It is an amenable number.

84920221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84920221 is an equidigital number, since it uses as much as digits as its factorization.

84920221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 84920221 is about 9215.2168178508. The cubic root of 84920221 is about 439.5453654611.

The spelling of 84920221 in words is "eighty-four million, nine hundred twenty thousand, two hundred twenty-one".