20011200221 has 4 divisors (see below), whose sum is σ = 20012683200. Its totient is φ = 20009717244.

The previous prime is 20011200217. The next prime is 20011200227. The reversal of 20011200221 is 12200211002.

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 20011200221 - 2² = 20011200217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011200227) 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, 721061 + ... + 748298.

It is an arithmetic number, because the mean of its divisors is an integer number (5003170800).

Almost surely, 2^20011200221 is an apocalyptic number.

It is an amenable number.

20011200221 is a deficient number, since it is larger than the sum of its proper divisors (1482979).

20011200221 is a wasteful number, since it uses less digits than its factorization.

20011200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482978.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011200221 its reverse (12200211002), we get a palindrome (32211411223).

The spelling of 20011200221 in words is "twenty billion, eleven million, two hundred thousand, two hundred twenty-one".