21629392 has 10 divisors (see below), whose sum is σ = 41906978. Its totient is φ = 10814688.

The previous prime is 21629381. The next prime is 21629393. The reversal of 21629392 is 29392612.

It can be written as a sum of positive squares in only one way, i.e., 11669056 + 9960336 = 3416^2 + 3156^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675903 + ... + 675934.

Almost surely, 2^21629392 is an apocalyptic number.

It is an amenable number.

21629392 is a deficient number, since it is larger than the sum of its proper divisors (20277586).

21629392 is a wasteful number, since it uses less digits than its factorization.

21629392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351845 (or 1351839 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 21629392 is about 4650.7410162253. The cubic root of 21629392 is about 278.6215927443.

The spelling of 21629392 in words is "twenty-one million, six hundred twenty-nine thousand, three hundred ninety-two".