21368402 has 8 divisors (see below), whose sum is σ = 34966512. Its totient is φ = 9712900.

The previous prime is 21368401. The next prime is 21368429. The reversal of 21368402 is 20486312.

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 (21368401) 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, 485624 + ... + 485667.

It is an arithmetic number, because the mean of its divisors is an integer number (4370814).

Almost surely, 2^21368402 is an apocalyptic number.

21368402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21368402 is a deficient number, since it is larger than the sum of its proper divisors (13598110).

21368402 is a wasteful number, since it uses less digits than its factorization.

21368402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971304.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21368402 is about 4622.5968891955. The cubic root of 21368402 is about 277.4963968907.

The spelling of 21368402 in words is "twenty-one million, three hundred sixty-eight thousand, four hundred two".