21965941 has 4 divisors (see below), whose sum is σ = 22192492. Its totient is φ = 21739392.

The previous prime is 21965927. The next prime is 21965959. The reversal of 21965941 is 14956912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8614225 + 13351716 = 2935^2 + 3654^2 .

It is a cyclic number.

It is not a de Polignac number, because 21965941 - 2¹⁵ = 21933173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21965941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21965971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113130 + ... + 113323.

It is an arithmetic number, because the mean of its divisors is an integer number (5548123).

Almost surely, 2^21965941 is an apocalyptic number.

It is an amenable number.

21965941 is a deficient number, since it is larger than the sum of its proper divisors (226551).

21965941 is an equidigital number, since it uses as much as digits as its factorization.

21965941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226550.

The product of its digits is 19440, while the sum is 37.

The square root of 21965941 is about 4686.7836519302. The cubic root of 21965941 is about 280.0592604162.

The spelling of 21965941 in words is "twenty-one million, nine hundred sixty-five thousand, nine hundred forty-one".