21013220201 has 4 divisors (see below), whose sum is σ = 21107450112. Its totient is φ = 20918990292.

The previous prime is 21013220167. The next prime is 21013220269. The reversal of 21013220201 is 10202231012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21013220201 - 2¹⁰ = 21013219177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26013220201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47114621 + ... + 47115066.

It is an arithmetic number, because the mean of its divisors is an integer number (5276862528).

Almost surely, 2^21013220201 is an apocalyptic number.

It is an amenable number.

21013220201 is a deficient number, since it is larger than the sum of its proper divisors (94229911).

21013220201 is an equidigital number, since it uses as much as digits as its factorization.

21013220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94229910.

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

Adding to 21013220201 its reverse (10202231012), we get a palindrome (31215451213).

The spelling of 21013220201 in words is "twenty-one billion, thirteen million, two hundred twenty thousand, two hundred one".