20100200102021 has 12 divisors (see below), whose sum is σ = 21946957018308. Its totient is φ = 18299865993984.

The previous prime is 20100200102009. The next prime is 20100200102107. The reversal of 20100200102021 is 12020100200102.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3170999332900 + 16929200769121 = 1780730^2 + 4114511^2 .

It is not a de Polignac number, because 20100200102021 - 2²² = 20100195907717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100200101993 and 20100200102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100200122021) 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, 145001960 + ... + 145140513.

It is an arithmetic number, because the mean of its divisors is an integer number (1828913084859).

Almost surely, 2^{20100200102021} is an apocalyptic number.

It is an amenable number.

20100200102021 is a deficient number, since it is larger than the sum of its proper divisors (1846756916287).

20100200102021 is an equidigital number, since it uses as much as digits as its factorization.

20100200102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290142632 (or 290142559 counting only the distinct ones).

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

Adding to 20100200102021 its reverse (12020100200102), we get a palindrome (32120300302123).

The spelling of 20100200102021 in words is "twenty trillion, one hundred billion, two hundred million, one hundred two thousand, twenty-one".