21234292 has 12 divisors (see below), whose sum is σ = 39346020. Its totient is φ = 9992576.

The previous prime is 21234281. The next prime is 21234299. The reversal of 21234292 is 29243212.

It can be written as a sum of positive squares in 2 ways, for example, as 8317456 + 12916836 = 2884^2 + 3594^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156067 + ... + 156202.

It is an arithmetic number, because the mean of its divisors is an integer number (3278835).

Almost surely, 2^21234292 is an apocalyptic number.

It is an amenable number.

21234292 is a deficient number, since it is larger than the sum of its proper divisors (18111728).

21234292 is a wasteful number, since it uses less digits than its factorization.

21234292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312290 (or 312288 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 21234292 is about 4608.0681418573. The cubic root of 21234292 is about 276.9146474246.

The spelling of 21234292 in words is "twenty-one million, two hundred thirty-four thousand, two hundred ninety-two".