21622941 has 6 divisors (see below), whose sum is σ = 31233150. Its totient is φ = 14415288.

The previous prime is 21622927. The next prime is 21622957. The reversal of 21622941 is 14922612.

It can be written as a sum of positive squares in only one way, i.e., 21622500 + 441 = 4650^2 + 21^2 .

It is not a de Polignac number, because 21622941 - 2⁷ = 21622813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622901) 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 in 5 ways as a sum of consecutive naturals, for example, 1201266 + ... + 1201283.

It is an arithmetic number, because the mean of its divisors is an integer number (5205525).

Almost surely, 2^21622941 is an apocalyptic number.

It is an amenable number.

21622941 is a deficient number, since it is larger than the sum of its proper divisors (9610209).

21622941 is a wasteful number, since it uses less digits than its factorization.

21622941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402555 (or 2402552 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21622941 is about 4650.0474191131. The cubic root of 21622941 is about 278.5938902148.

The spelling of 21622941 in words is "twenty-one million, six hundred twenty-two thousand, nine hundred forty-one".