21941845 has 16 divisors (see below), whose sum is σ = 26832960. Its totient is φ = 17222400.

The previous prime is 21941837. The next prime is 21941863. The reversal of 21941845 is 54814912.

It is a happy number.

It is not a de Polignac number, because 21941845 - 2³ = 21941837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21941845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90925 + ... + 91165.

It is an arithmetic number, because the mean of its divisors is an integer number (1677060).

Almost surely, 2^21941845 is an apocalyptic number.

It is an amenable number.

21941845 is a deficient number, since it is larger than the sum of its proper divisors (4891115).

21941845 is a wasteful number, since it uses less digits than its factorization.

21941845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its digits is 11520, while the sum is 34.

The square root of 21941845 is about 4684.2123137194. The cubic root of 21941845 is about 279.9568173201.

The spelling of 21941845 in words is "twenty-one million, nine hundred forty-one thousand, eight hundred forty-five".