21221140201 has 4 divisors (see below), whose sum is σ = 21228713872. Its totient is φ = 21213566532.

The previous prime is 21221140183. The next prime is 21221140207. The reversal of 21221140201 is 10204112212.

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 21221140201 - 2⁵ = 21221140169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221140207) 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, 3782631 + ... + 3788236.

It is an arithmetic number, because the mean of its divisors is an integer number (5307178468).

Almost surely, 2^21221140201 is an apocalyptic number.

It is an amenable number.

21221140201 is a deficient number, since it is larger than the sum of its proper divisors (7573671).

21221140201 is an equidigital number, since it uses as much as digits as its factorization.

21221140201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573670.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221140201 its reverse (10204112212), we get a palindrome (31425252413).

The spelling of 21221140201 in words is "twenty-one billion, two hundred twenty-one million, one hundred forty thousand, two hundred one".