20212100011021 has 4 divisors (see below), whose sum is σ = 20212243982272. Its totient is φ = 20211956039772.

The previous prime is 20212100011001. The next prime is 20212100011043. The reversal of 20212100011021 is 12011000121202.

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 20212100011021 - 2¹⁵ = 20212099978253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212100010992 and 20212100011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212100011001) 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, 71774835 + ... + 72055888.

It is an arithmetic number, because the mean of its divisors is an integer number (5053060995568).

Almost surely, 2^{20212100011021} is an apocalyptic number.

It is an amenable number.

20212100011021 is a deficient number, since it is larger than the sum of its proper divisors (143971251).

20212100011021 is a wasteful number, since it uses less digits than its factorization.

20212100011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143971250.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20212100011021 its reverse (12011000121202), we get a palindrome (32223100132223).

The spelling of 20212100011021 in words is "twenty trillion, two hundred twelve billion, one hundred million, eleven thousand, twenty-one".