20021212101021 has 4 divisors (see below), whose sum is σ = 26694949468032. Its totient is φ = 13347474734012.

The previous prime is 20021212100971. The next prime is 20021212101101. The reversal of 20021212101021 is 12010121212002.

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 20021212101021 - 2²⁷ = 20021077883293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021212181021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3336868683501 + ... + 3336868683506.

It is an arithmetic number, because the mean of its divisors is an integer number (6673737367008).

Almost surely, 2^{20021212101021} is an apocalyptic number.

It is an amenable number.

20021212101021 is a deficient number, since it is larger than the sum of its proper divisors (6673737367011).

20021212101021 is an equidigital number, since it uses as much as digits as its factorization.

20021212101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673737367010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021212101021 its reverse (12010121212002), we get a palindrome (32031333313023).

The spelling of 20021212101021 in words is "twenty trillion, twenty-one billion, two hundred twelve million, one hundred one thousand, twenty-one".