21470201 has 16 divisors (see below), whose sum is σ = 24292224. Its totient is φ = 18864384.

The previous prime is 21470149. The next prime is 21470219. The reversal of 21470201 is 10207412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21470201.

It is not an unprimeable number, because it can be changed into a prime (21470261) 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, 16175 + ... + 17451.

It is an arithmetic number, because the mean of its divisors is an integer number (1518264).

Almost surely, 2^21470201 is an apocalyptic number.

It is an amenable number.

21470201 is a deficient number, since it is larger than the sum of its proper divisors (2822023).

21470201 is a wasteful number, since it uses less digits than its factorization.

21470201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21470201 is about 4633.5948247554. The cubic root of 21470201 is about 277.9363629506.

Adding to 21470201 its reverse (10207412), we get a palindrome (31677613).

The spelling of 21470201 in words is "twenty-one million, four hundred seventy thousand, two hundred one".