21412401 has 16 divisors (see below), whose sum is σ = 30875904. Its totient is φ = 13147904.

The previous prime is 21412387. The next prime is 21412429. The reversal of 21412401 is 10421412.

It is a cyclic number.

It is not a de Polignac number, because 21412401 - 2⁶ = 21412337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21412441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2070 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (1929744).

Almost surely, 2^21412401 is an apocalyptic number.

It is an amenable number.

21412401 is a deficient number, since it is larger than the sum of its proper divisors (9463503).

21412401 is a wasteful number, since it uses less digits than its factorization.

21412401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21412401 is about 4627.3535633232. The cubic root of 21412401 is about 277.6867276640.

Adding to 21412401 its reverse (10421412), we get a palindrome (31833813).

The spelling of 21412401 in words is "twenty-one million, four hundred twelve thousand, four hundred one".