21137941 has 4 divisors (see below), whose sum is σ = 23059584. Its totient is φ = 19216300.

The previous prime is 21137929. The next prime is 21137959. The reversal of 21137941 is 14973112.

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 21137941 - 2⁷ = 21137813 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 (21137911) 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, 960805 + ... + 960826.

It is an arithmetic number, because the mean of its divisors is an integer number (5764896).

Almost surely, 2^21137941 is an apocalyptic number.

It is an amenable number.

21137941 is a deficient number, since it is larger than the sum of its proper divisors (1921643).

21137941 is a wasteful number, since it uses less digits than its factorization.

21137941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921642.

The product of its digits is 1512, while the sum is 28.

The square root of 21137941 is about 4597.6016573862. The cubic root of 21137941 is about 276.4951771888.

The spelling of 21137941 in words is "twenty-one million, one hundred thirty-seven thousand, nine hundred forty-one".