21729362 has 8 divisors (see below), whose sum is σ = 33352176. Its totient is φ = 10611972.

The previous prime is 21729361. The next prime is 21729377. The reversal of 21729362 is 26392712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21729361) 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, 126248 + ... + 126419.

It is an arithmetic number, because the mean of its divisors is an integer number (4169022).

Almost surely, 2^21729362 is an apocalyptic number.

21729362 is a deficient number, since it is larger than the sum of its proper divisors (11622814).

21729362 is a wasteful number, since it uses less digits than its factorization.

21729362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252712.

The product of its digits is 9072, while the sum is 32.

The square root of 21729362 is about 4661.4763755703. The cubic root of 21729362 is about 279.0501915927.

The spelling of 21729362 in words is "twenty-one million, seven hundred twenty-nine thousand, three hundred sixty-two".