21347704 has 16 divisors (see below), whose sum is σ = 45745200. Its totient is φ = 9148992.

The previous prime is 21347701. The next prime is 21347707. The reversal of 21347704 is 40774312.

It is an interprime number because it is at equal distance from previous prime (21347701) and next prime (21347707).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347701) 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, 190549 + ... + 190660.

It is an arithmetic number, because the mean of its divisors is an integer number (2859075).

Almost surely, 2^21347704 is an apocalyptic number.

It is an amenable number.

21347704 is an abundant number, since it is smaller than the sum of its proper divisors (24397496).

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

21347704 is a wasteful number, since it uses less digits than its factorization.

21347704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381222 (or 381218 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 21347704 is about 4620.3575619209. The cubic root of 21347704 is about 277.4067711605.

The spelling of 21347704 in words is "twenty-one million, three hundred forty-seven thousand, seven hundred four".