20100202020021 has 4 divisors (see below), whose sum is σ = 26800269360032. Its totient is φ = 13400134680012.

The previous prime is 20100202019993. The next prime is 20100202020061. The reversal of 20100202020021 is 12002020200102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20100202020021 - 2³⁷ = 19962763066549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100202019979 and 20100202020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100202020061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3350033670001 + ... + 3350033670006.

It is an arithmetic number, because the mean of its divisors is an integer number (6700067340008).

Almost surely, 2^{20100202020021} is an apocalyptic number.

It is an amenable number.

20100202020021 is a deficient number, since it is larger than the sum of its proper divisors (6700067340011).

20100202020021 is an equidigital number, since it uses as much as digits as its factorization.

20100202020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700067340010.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20100202020021 its reverse (12002020200102), we get a palindrome (32102222220123).

The spelling of 20100202020021 in words is "twenty trillion, one hundred billion, two hundred two million, twenty thousand, twenty-one".