20000101221 has 12 divisors (see below), whose sum is σ = 28894358220. Its totient is φ = 13330944000.

The previous prime is 20000101217. The next prime is 20000101223. The reversal of 20000101221 is 12210100002.

It can be written as a sum of positive squares in 2 ways, for example, as 13022004996 + 6978096225 = 114114^2 + 83535^2 .

It is not a de Polignac number, because 20000101221 - 2² = 20000101217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000101223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152476 + ... + 251493.

It is an arithmetic number, because the mean of its divisors is an integer number (2407863185).

Almost surely, 2^20000101221 is an apocalyptic number.

It is an amenable number.

20000101221 is a deficient number, since it is larger than the sum of its proper divisors (8894256999).

20000101221 is a wasteful number, since it uses less digits than its factorization.

20000101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409476 (or 409473 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20000101221 its reverse (12210100002), we get a palindrome (32210201223).

The spelling of 20000101221 in words is "twenty billion, one hundred one thousand, two hundred twenty-one".