21743090 has 16 divisors (see below), whose sum is σ = 40400640. Its totient is φ = 8416560.

The previous prime is 21743083. The next prime is 21743107. The reversal of 21743090 is 9034712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34760 + ... + 35379.

It is an arithmetic number, because the mean of its divisors is an integer number (2525040).

Almost surely, 2^21743090 is an apocalyptic number.

21743090 is a deficient number, since it is larger than the sum of its proper divisors (18657550).

21743090 is a wasteful number, since it uses less digits than its factorization.

21743090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70177.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21743090 is about 4662.9486379329. The cubic root of 21743090 is about 279.1089445769.

The spelling of 21743090 in words is "twenty-one million, seven hundred forty-three thousand, ninety".