21294902 has 4 divisors (see below), whose sum is σ = 31942356. Its totient is φ = 10647450.

The previous prime is 21294893. The next prime is 21294907. The reversal of 21294902 is 20949212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5323724 + ... + 5323727.

It is an arithmetic number, because the mean of its divisors is an integer number (7985589).

Almost surely, 2^21294902 is an apocalyptic number.

21294902 is a deficient number, since it is larger than the sum of its proper divisors (10647454).

21294902 is a wasteful number, since it uses less digits than its factorization.

21294902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10647453.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21294902 is about 4614.6399642876. The cubic root of 21294902 is about 277.1778671439.

The spelling of 21294902 in words is "twenty-one million, two hundred ninety-four thousand, nine hundred two".