20210012201021 has 4 divisors (see below), whose sum is σ = 20906909173500. Its totient is φ = 19513115228544.

The previous prime is 20210012201011. The next prime is 20210012201033. The reversal of 20210012201021 is 12010221001202.

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 5131973728996 + 15078038472025 = 2265386^2 + 3883045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210012201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210012200987 and 20210012201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210012201011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348448486196 + ... + 348448486253.

It is an arithmetic number, because the mean of its divisors is an integer number (5226727293375).

Almost surely, 2^{20210012201021} is an apocalyptic number.

It is an amenable number.

20210012201021 is a deficient number, since it is larger than the sum of its proper divisors (696896972479).

20210012201021 is an equidigital number, since it uses as much as digits as its factorization.

20210012201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696896972478.

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

Adding to 20210012201021 its reverse (12010221001202), we get a palindrome (32220233202223).

The spelling of 20210012201021 in words is "twenty trillion, two hundred ten billion, twelve million, two hundred one thousand, twenty-one".