21221303201 has 32 divisors (see below), whose sum is σ = 26602007040. Its totient is φ = 16514150400.

The previous prime is 21221303153. The next prime is 21221303209. The reversal of 21221303201 is 10230312212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221303201 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21221303201.

It is not an unprimeable number, because it can be changed into a prime (21221303209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409796 + ... + 458666.

It is an arithmetic number, because the mean of its divisors is an integer number (831312720).

Almost surely, 2^21221303201 is an apocalyptic number.

It is an amenable number.

21221303201 is a deficient number, since it is larger than the sum of its proper divisors (5380703839).

21221303201 is a wasteful number, since it uses less digits than its factorization.

21221303201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49025.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21221303201 its reverse (10230312212), we get a palindrome (31451615413).

The spelling of 21221303201 in words is "twenty-one billion, two hundred twenty-one million, three hundred three thousand, two hundred one".