20002001221 has 4 divisors (see below), whose sum is σ = 20871653472. Its totient is φ = 19132348972.

The previous prime is 20002001213. The next prime is 20002001269. The reversal of 20002001221 is 12210020002.

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 20002001221 - 2³ = 20002001213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002001198 and 20002001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002001021) 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, 434826091 + ... + 434826136.

It is an arithmetic number, because the mean of its divisors is an integer number (5217913368).

Almost surely, 2^20002001221 is an apocalyptic number.

It is an amenable number.

20002001221 is a deficient number, since it is larger than the sum of its proper divisors (869652251).

20002001221 is an equidigital number, since it uses as much as digits as its factorization.

20002001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869652250.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20002001221 its reverse (12210020002), we get a palindrome (32212021223).

The spelling of 20002001221 in words is "twenty billion, two million, one thousand, two hundred twenty-one".