21970093 has 2 divisors, whose sum is σ = 21970094. Its totient is φ = 21970092.

The previous prime is 21970087. The next prime is 21970097. The reversal of 21970093 is 39007912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16670889 + 5299204 = 4083^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 21970093 - 2⁹ = 21969581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21970097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10985046 + 10985047.

It is an arithmetic number, because the mean of its divisors is an integer number (10985047).

Almost surely, 2^21970093 is an apocalyptic number.

It is an amenable number.

21970093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21970093 is an equidigital number, since it uses as much as digits as its factorization.

21970093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 21970093 is about 4687.2265786924. The cubic root of 21970093 is about 280.0769048957.

The spelling of 21970093 in words is "twenty-one million, nine hundred seventy thousand, ninety-three".