21029394 has 16 divisors (see below), whose sum is σ = 43195968. Its totient is φ = 6820272.

The previous prime is 21029389. The next prime is 21029399. The reversal of 21029394 is 49392012.

It is an interprime number because it is at equal distance from previous prime (21029389) and next prime (21029399).

It is not an unprimeable number, because it can be changed into a prime (21029399) 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, 47142 + ... + 47585.

It is an arithmetic number, because the mean of its divisors is an integer number (2699748).

Almost surely, 2^21029394 is an apocalyptic number.

21029394 is an abundant number, since it is smaller than the sum of its proper divisors (22166574).

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

21029394 is a wasteful number, since it uses less digits than its factorization.

21029394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94769.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 21029394 is about 4585.7817218005. The cubic root of 21029394 is about 276.0210811455.

The spelling of 21029394 in words is "twenty-one million, twenty-nine thousand, three hundred ninety-four".