20102210012021 has 4 divisors (see below), whose sum is σ = 20170818237612. Its totient is φ = 20033601786432.

The previous prime is 20102210011993. The next prime is 20102210012077. The reversal of 20102210012021 is 12021001220102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9186051722500 + 10916158289521 = 3030850^2 + 3303961^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102210012021 - 2⁶ = 20102210011957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102210011987 and 20102210012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102210012821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34304112356 + ... + 34304112941.

It is an arithmetic number, because the mean of its divisors is an integer number (5042704559403).

Almost surely, 2^{20102210012021} is an apocalyptic number.

It is an amenable number.

20102210012021 is a deficient number, since it is larger than the sum of its proper divisors (68608225591).

20102210012021 is an equidigital number, since it uses as much as digits as its factorization.

20102210012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68608225590.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20102210012021 its reverse (12021001220102), we get a palindrome (32123211232123).

The spelling of 20102210012021 in words is "twenty trillion, one hundred two billion, two hundred ten million, twelve thousand, twenty-one".