21941633 has 4 divisors (see below), whose sum is σ = 25076160. Its totient is φ = 18807108.

The previous prime is 21941581. The next prime is 21941651. The reversal of 21941633 is 33614912.

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 21941633 - 2²⁴ = 5164417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21941596 and 21941605.

It is not an unprimeable number, because it can be changed into a prime (21941233) 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, 1567253 + ... + 1567266.

It is an arithmetic number, because the mean of its divisors is an integer number (6269040).

Almost surely, 2^21941633 is an apocalyptic number.

It is an amenable number.

21941633 is a deficient number, since it is larger than the sum of its proper divisors (3134527).

21941633 is an equidigital number, since it uses as much as digits as its factorization.

21941633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134526.

The product of its digits is 3888, while the sum is 29.

The square root of 21941633 is about 4684.1896844598. The cubic root of 21941633 is about 279.9559156786.

The spelling of 21941633 in words is "twenty-one million, nine hundred forty-one thousand, six hundred thirty-three".