21402203 has 8 divisors (see below), whose sum is σ = 22362480. Its totient is φ = 20456800.

The previous prime is 21402197. The next prime is 21402209. The reversal of 21402203 is 30220412.

It is an interprime number because it is at equal distance from previous prime (21402197) and next prime (21402209).

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

It is a cyclic number.

It is not a de Polignac number, because 21402203 - 2⁴ = 21402187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21402209) 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, 725 + ... + 6582.

It is an arithmetic number, because the mean of its divisors is an integer number (2795310).

Almost surely, 2^21402203 is an apocalyptic number.

21402203 is a deficient number, since it is larger than the sum of its proper divisors (960277).

21402203 is a wasteful number, since it uses less digits than its factorization.

21402203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21402203 is about 4626.2515063494. The cubic root of 21402203 is about 277.6426364084.

Adding to 21402203 its reverse (30220412), we get a palindrome (51622615).

The spelling of 21402203 in words is "twenty-one million, four hundred two thousand, two hundred three".