21964741 has 4 divisors (see below), whose sum is σ = 23120800. Its totient is φ = 20808684.

The previous prime is 21964729. The next prime is 21964763. The reversal of 21964741 is 14746912.

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 21964741 - 2¹⁹ = 21440453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21964697 and 21964706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964721) 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, 578001 + ... + 578038.

It is an arithmetic number, because the mean of its divisors is an integer number (5780200).

Almost surely, 2^21964741 is an apocalyptic number.

It is an amenable number.

21964741 is a deficient number, since it is larger than the sum of its proper divisors (1156059).

21964741 is a wasteful number, since it uses less digits than its factorization.

21964741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156058.

The product of its digits is 12096, while the sum is 34.

The square root of 21964741 is about 4686.6556306176. The cubic root of 21964741 is about 280.0541604414.

The spelling of 21964741 in words is "twenty-one million, nine hundred sixty-four thousand, seven hundred forty-one".