21302401 has 4 divisors (see below), whose sum is σ = 22423600. Its totient is φ = 20181204.

The previous prime is 21302399. The next prime is 21302419. The reversal of 21302401 is 10420312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21302401 - 2¹ = 21302399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300401) 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, 560571 + ... + 560608.

It is an arithmetic number, because the mean of its divisors is an integer number (5605900).

Almost surely, 2^21302401 is an apocalyptic number.

It is an amenable number.

21302401 is a deficient number, since it is larger than the sum of its proper divisors (1121199).

21302401 is a wasteful number, since it uses less digits than its factorization.

21302401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121198.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21302401 is about 4615.4524155276. The cubic root of 21302401 is about 277.2103993886.

Adding to 21302401 its reverse (10420312), we get a palindrome (31722713).

The spelling of 21302401 in words is "twenty-one million, three hundred two thousand, four hundred one".