21335402 has 8 divisors (see below), whose sum is σ = 34912512. Its totient is φ = 9697900.

The previous prime is 21335389. The next prime is 21335411. The reversal of 21335402 is 20453312.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484874 + ... + 484917.

It is an arithmetic number, because the mean of its divisors is an integer number (4364064).

Almost surely, 2^21335402 is an apocalyptic number.

21335402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21335402 is a deficient number, since it is larger than the sum of its proper divisors (13577110).

21335402 is a wasteful number, since it uses less digits than its factorization.

21335402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969804.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21335402 is about 4619.0260878241. The cubic root of 21335402 is about 277.3534740340.

Adding to 21335402 its reverse (20453312), we get a palindrome (41788714).

The spelling of 21335402 in words is "twenty-one million, three hundred thirty-five thousand, four hundred two".