21303402 has 8 divisors (see below), whose sum is σ = 42606816. Its totient is φ = 7101132.

The previous prime is 21303349. The next prime is 21303407. The reversal of 21303402 is 20430312.

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

21303402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21303407) 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, 1775278 + ... + 1775289.

It is an arithmetic number, because the mean of its divisors is an integer number (5325852).

Almost surely, 2^21303402 is an apocalyptic number.

21303402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21303402 is a wasteful number, since it uses less digits than its factorization.

21303402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550572.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21303402 is about 4615.5608543275. The cubic root of 21303402 is about 277.2147413602.

Adding to 21303402 its reverse (20430312), we get a palindrome (41733714).

The spelling of 21303402 in words is "twenty-one million, three hundred three thousand, four hundred two".