20102010101221 has 8 divisors (see below), whose sum is σ = 20483909813880. Its totient is φ = 19720207296192.

The previous prime is 20102010101207. The next prime is 20102010101231. The reversal of 20102010101221 is 12210101020102.

It can be written as a sum of positive squares in 4 ways, for example, as 3494510548321 + 16607499552900 = 1869361^2 + 4075230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20102010101221 - 2⁵ = 20102010101189 is a prime.

It is a super-2 number, since 2×20102010101221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102010101231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23808030 + ... + 24637903.

It is an arithmetic number, because the mean of its divisors is an integer number (2560488726735).

Almost surely, 2^{20102010101221} is an apocalyptic number.

It is an amenable number.

20102010101221 is a deficient number, since it is larger than the sum of its proper divisors (381899712659).

20102010101221 is an equidigital number, since it uses as much as digits as its factorization.

20102010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48453815.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20102010101221 its reverse (12210101020102), we get a palindrome (32312111121323).

The spelling of 20102010101221 in words is "twenty trillion, one hundred two billion, ten million, one hundred one thousand, two hundred twenty-one".