21431201 has 8 divisors (see below), whose sum is σ = 23877504. Its totient is φ = 19067920.

The previous prime is 21431197. The next prime is 21431209. The reversal of 21431201 is 10213412.

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 21431201 - 2² = 21431197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21431209) 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, 20210 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (2984688).

Almost surely, 2^21431201 is an apocalyptic number.

It is an amenable number.

21431201 is a deficient number, since it is larger than the sum of its proper divisors (2446303).

21431201 is a wasteful number, since it uses less digits than its factorization.

21431201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41511.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21431201 is about 4629.3845163261. The cubic root of 21431201 is about 277.7679731591.

Adding to 21431201 its reverse (10213412), we get a palindrome (31644613).

The spelling of 21431201 in words is "twenty-one million, four hundred thirty-one thousand, two hundred one".