21202394 has 16 divisors (see below), whose sum is σ = 32272128. Its totient is φ = 10446432.

The previous prime is 21202387. The next prime is 21202399. The reversal of 21202394 is 49320212.

It is a super-2 number, since 2×21202394² = 899083022662472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21202399) 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, 60929 + ... + 61275.

It is an arithmetic number, because the mean of its divisors is an integer number (2017008).

Almost surely, 2^21202394 is an apocalyptic number.

21202394 is a deficient number, since it is larger than the sum of its proper divisors (11069734).

21202394 is a wasteful number, since it uses less digits than its factorization.

21202394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21202394 is about 4604.6057377369. The cubic root of 21202394 is about 276.7759182080.

The spelling of 21202394 in words is "twenty-one million, two hundred two thousand, three hundred ninety-four".