21303401 has 8 divisors (see below), whose sum is σ = 24376704. Its totient is φ = 18237600.

The previous prime is 21303349. The next prime is 21303407. The reversal of 21303401 is 10430312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303401 is a prime.

It is a super-4 number, since 4×21303401⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 7076 + ... + 9626.

It is an arithmetic number, because the mean of its divisors is an integer number (3047088).

Almost surely, 2^21303401 is an apocalyptic number.

It is an amenable number.

21303401 is a deficient number, since it is larger than the sum of its proper divisors (3073303).

21303401 is a wasteful number, since it uses less digits than its factorization.

21303401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21303401 is about 4615.5607459983. The cubic root of 21303401 is about 277.2147370227.

Adding to 21303401 its reverse (10430312), we get a palindrome (31733713).

The spelling of 21303401 in words is "twenty-one million, three hundred three thousand, four hundred one".