21743742 has 32 divisors (see below), whose sum is σ = 44582400. Its totient is φ = 7067648.

The previous prime is 21743737. The next prime is 21743749. The reversal of 21743742 is 24734712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21743749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84478 + ... + 84734.

It is an arithmetic number, because the mean of its divisors is an integer number (1393200).

Almost surely, 2^21743742 is an apocalyptic number.

21743742 is an abundant number, since it is smaller than the sum of its proper divisors (22838658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21743742 is a wasteful number, since it uses less digits than its factorization.

21743742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its digits is 9408, while the sum is 30.

The square root of 21743742 is about 4663.0185502526. The cubic root of 21743742 is about 279.1117343860. Note that the first 3 decimals are identical.

The spelling of 21743742 in words is "twenty-one million, seven hundred forty-three thousand, seven hundred forty-two".