21700941 has 4 divisors (see below), whose sum is σ = 28934592. Its totient is φ = 14467292.

The previous prime is 21700901. The next prime is 21700949. The reversal of 21700941 is 14900712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21700941 - 2¹⁴ = 21684557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3616821 + ... + 3616826.

It is an arithmetic number, because the mean of its divisors is an integer number (7233648).

Almost surely, 2^21700941 is an apocalyptic number.

It is an amenable number.

21700941 is a deficient number, since it is larger than the sum of its proper divisors (7233651).

21700941 is an equidigital number, since it uses as much as digits as its factorization.

21700941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7233650.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21700941 is about 4658.4268803964. The cubic root of 21700941 is about 278.9284769323.

The spelling of 21700941 in words is "twenty-one million, seven hundred thousand, nine hundred forty-one".