21236402 has 8 divisors (see below), whose sum is σ = 34750512. Its totient is φ = 9652900.

The previous prime is 21236399. The next prime is 21236419. The reversal of 21236402 is 20463212.

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, 482624 + ... + 482667.

It is an arithmetic number, because the mean of its divisors is an integer number (4343814).

Almost surely, 2^21236402 is an apocalyptic number.

21236402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21236402 is a deficient number, since it is larger than the sum of its proper divisors (13514110).

21236402 is a wasteful number, since it uses less digits than its factorization.

21236402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965304.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21236402 is about 4608.2970824373. The cubic root of 21236402 is about 276.9238192327.

Adding to 21236402 its reverse (20463212), we get a palindrome (41699614).

The spelling of 21236402 in words is "twenty-one million, two hundred thirty-six thousand, four hundred two".