21140941 has 4 divisors (see below), whose sum is σ = 21210112. Its totient is φ = 21071772.

The previous prime is 21140921. The next prime is 21140957. The reversal of 21140941 is 14904112.

21140941 = 94² + 95² + ... + 400².

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 21140941 - 2⁵ = 21140909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140921) 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, 34125 + ... + 34738.

It is an arithmetic number, because the mean of its divisors is an integer number (5302528).

Almost surely, 2^21140941 is an apocalyptic number.

It is an amenable number.

21140941 is a deficient number, since it is larger than the sum of its proper divisors (69171).

21140941 is an equidigital number, since it uses as much as digits as its factorization.

21140941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69170.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21140941 is about 4597.9279028710. The cubic root of 21140941 is about 276.5082570862.

The spelling of 21140941 in words is "twenty-one million, one hundred forty thousand, nine hundred forty-one".