21301338 has 16 divisors (see below), whose sum is σ = 42890400. Its totient is φ = 7052496.

The previous prime is 21301331. The next prime is 21301339. The reversal of 21301338 is 83310312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21301331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11020 + ... + 12807.

It is an arithmetic number, because the mean of its divisors is an integer number (2680650).

Almost surely, 2^21301338 is an apocalyptic number.

21301338 is an abundant number, since it is smaller than the sum of its proper divisors (21589062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21301338 is a wasteful number, since it uses less digits than its factorization.

21301338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23981.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21301338 is about 4615.3372574493. The cubic root of 21301338 is about 277.2057883347.

The spelling of 21301338 in words is "twenty-one million, three hundred one thousand, three hundred thirty-eight".