21940441 has 2 divisors, whose sum is σ = 21940442. Its totient is φ = 21940440.

The previous prime is 21940427. The next prime is 21940483. The reversal of 21940441 is 14404912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 9585216 = 3515^2 + 3096^2 .

It is a cyclic number.

It is not a de Polignac number, because 21940441 - 2⁵ = 21940409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21940241) 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, 10970220 + 10970221.

It is an arithmetic number, because the mean of its divisors is an integer number (10970221).

Almost surely, 2^21940441 is an apocalyptic number.

It is an amenable number.

21940441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21940441 is an equidigital number, since it uses as much as digits as its factorization.

21940441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21940441 is about 4684.0624462106. The cubic root of 21940441 is about 279.9508459633.

The spelling of 21940441 in words is "twenty-one million, nine hundred forty thousand, four hundred forty-one".