21394704 has 80 divisors (see below), whose sum is σ = 59246208. Its totient is φ = 6629376.

The previous prime is 21394697. The next prime is 21394733. The reversal of 21394704 is 40749312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128029 + ... + 128195.

Almost surely, 2^21394704 is an apocalyptic number.

21394704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21394704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29623104).

21394704 is an abundant number, since it is smaller than the sum of its proper divisors (37851504).

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

21394704 is a wasteful number, since it uses less digits than its factorization.

21394704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21394704 is about 4625.4409519526. The cubic root of 21394704 is about 277.6102053957.

The spelling of 21394704 in words is "twenty-one million, three hundred ninety-four thousand, seven hundred four".