21360742 has 16 divisors (see below), whose sum is σ = 34588512. Its totient is φ = 9835200.

The previous prime is 21360709. The next prime is 21360743. The reversal of 21360742 is 24706312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14943 + ... + 16309.

It is an arithmetic number, because the mean of its divisors is an integer number (2161782).

Almost surely, 2^21360742 is an apocalyptic number.

21360742 is a deficient number, since it is larger than the sum of its proper divisors (13227770).

21360742 is a wasteful number, since it uses less digits than its factorization.

21360742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21360742 is about 4621.7682763202. The cubic root of 21360742 is about 277.4632345849.

The spelling of 21360742 in words is "twenty-one million, three hundred sixty thousand, seven hundred forty-two".