21353401 has 2 divisors, whose sum is σ = 21353402. Its totient is φ = 21353400.

The previous prime is 21353383. The next prime is 21353417. The reversal of 21353401 is 10435312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 9759376 = 3405^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 21353401 - 2⁷ = 21353273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21353441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676700 + 10676701.

It is an arithmetic number, because the mean of its divisors is an integer number (10676701).

Almost surely, 2^21353401 is an apocalyptic number.

It is an amenable number.

21353401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353401 is an equidigital number, since it uses as much as digits as its factorization.

21353401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21353401 is about 4620.9740315219. The cubic root of 21353401 is about 277.4314458798.

Adding to 21353401 its reverse (10435312), we get a palindrome (31788713).

The spelling of 21353401 in words is "twenty-one million, three hundred fifty-three thousand, four hundred one".