21943136 has 12 divisors (see below), whose sum is σ = 43200612. Its totient is φ = 10971552.

The previous prime is 21943099. The next prime is 21943171. The reversal of 21943136 is 63134912.

It is a junction number, because it is equal to n+sod(n) for n = 21943099 and 21943108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342830 + ... + 342893.

It is an arithmetic number, because the mean of its divisors is an integer number (3600051).

Almost surely, 2^21943136 is an apocalyptic number.

It is an amenable number.

21943136 is a deficient number, since it is larger than the sum of its proper divisors (21257476).

21943136 is an equidigital number, since it uses as much as digits as its factorization.

21943136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685733 (or 685725 counting only the distinct ones).

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

The square root of 21943136 is about 4684.3501150106. The cubic root of 21943136 is about 279.9623078515.

The spelling of 21943136 in words is "twenty-one million, nine hundred forty-three thousand, one hundred thirty-six".