21650738 has 8 divisors (see below), whose sum is σ = 33167232. Its totient is φ = 10594996.

The previous prime is 21650737. The next prime is 21650753. The reversal of 21650738 is 83705612.

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 (21650731) 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, 115070 + ... + 115257.

It is an arithmetic number, because the mean of its divisors is an integer number (4145904).

Almost surely, 2^21650738 is an apocalyptic number.

21650738 is a deficient number, since it is larger than the sum of its proper divisors (11516494).

21650738 is a wasteful number, since it uses less digits than its factorization.

21650738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230376.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21650738 is about 4653.0353534010. The cubic root of 21650738 is about 278.7132196238.

The spelling of 21650738 in words is "twenty-one million, six hundred fifty thousand, seven hundred thirty-eight".