20102100221 has 16 divisors (see below), whose sum is σ = 23102208000. Its totient is φ = 17134186608.

The previous prime is 20102100199. The next prime is 20102100223. The reversal of 20102100221 is 12200120102.

It is a happy number.

It is not a de Polignac number, because 20102100221 - 2⁶ = 20102100157 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 (20102100223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3706850 + ... + 3712268.

It is an arithmetic number, because the mean of its divisors is an integer number (1443888000).

Almost surely, 2^20102100221 is an apocalyptic number.

It is an amenable number.

20102100221 is a deficient number, since it is larger than the sum of its proper divisors (3000107779).

20102100221 is a wasteful number, since it uses less digits than its factorization.

20102100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8288.

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

Adding to 20102100221 its reverse (12200120102), we get a palindrome (32302220323).

The spelling of 20102100221 in words is "twenty billion, one hundred two million, one hundred thousand, two hundred twenty-one".