21965741 has 8 divisors (see below), whose sum is σ = 25148544. Its totient is φ = 18794160.

The previous prime is 21965737. The next prime is 21965743. The reversal of 21965741 is 14756912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21965741 - 2² = 21965737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21965743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1931 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (3143568).

Almost surely, 2^21965741 is an apocalyptic number.

It is an amenable number.

21965741 is a deficient number, since it is larger than the sum of its proper divisors (3182803).

21965741 is an equidigital number, since it uses as much as digits as its factorization.

21965741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611.

The product of its digits is 15120, while the sum is 35.

The square root of 21965741 is about 4686.7623152876. The cubic root of 21965741 is about 280.0584104333.

The spelling of 21965741 in words is "twenty-one million, nine hundred sixty-five thousand, seven hundred forty-one".