20212002121021 has 4 divisors (see below), whose sum is σ = 20241595096992. Its totient is φ = 20182409145052.

The previous prime is 20212002121019. The next prime is 20212002121079. The reversal of 20212002121021 is 12012120021202.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20212002121021 - 2¹ = 20212002121019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212002120986 and 20212002121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212002121121) 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, 14796486961 + ... + 14796488326.

It is an arithmetic number, because the mean of its divisors is an integer number (5060398774248).

Almost surely, 2^{20212002121021} is an apocalyptic number.

It is an amenable number.

20212002121021 is a deficient number, since it is larger than the sum of its proper divisors (29592975971).

20212002121021 is an equidigital number, since it uses as much as digits as its factorization.

20212002121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29592975970.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20212002121021 its reverse (12012120021202), we get a palindrome (32224122142223).

The spelling of 20212002121021 in words is "twenty trillion, two hundred twelve billion, two million, one hundred twenty-one thousand, twenty-one".