21302394 has 32 divisors (see below), whose sum is σ = 46573056. Its totient is φ = 6466560.

The previous prime is 21302389. The next prime is 21302399. The reversal of 21302394 is 49320312.

It is an interprime number because it is at equal distance from previous prime (21302389) and next prime (21302399).

It is not an unprimeable number, because it can be changed into a prime (21302399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (1455408).

Almost surely, 2^21302394 is an apocalyptic number.

21302394 is an abundant number, since it is smaller than the sum of its proper divisors (25270662).

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

21302394 is a wasteful number, since it uses less digits than its factorization.

21302394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21302394 is about 4615.4516572054. The cubic root of 21302394 is about 277.2103690247.

The spelling of 21302394 in words is "twenty-one million, three hundred two thousand, three hundred ninety-four".