21740710 has 8 divisors (see below), whose sum is σ = 39133296. Its totient is φ = 8696280.

The previous prime is 21740687. The next prime is 21740711. The reversal of 21740710 is 1704712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087026 + ... + 1087045.

It is an arithmetic number, because the mean of its divisors is an integer number (4891662).

Almost surely, 2^21740710 is an apocalyptic number.

21740710 is a deficient number, since it is larger than the sum of its proper divisors (17392586).

21740710 is a wasteful number, since it uses less digits than its factorization.

21740710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174078.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21740710 is about 4662.6934276231. The cubic root of 21740710 is about 279.0987604444.

The spelling of 21740710 in words is "twenty-one million, seven hundred forty thousand, seven hundred ten".