211202021122021 has 4 divisors (see below), whose sum is σ = 218014989545344. Its totient is φ = 204389052698700.

The previous prime is 211202021122019. The next prime is 211202021122063. The reversal of 211202021122021 is 120221120202112.

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 211202021122021 - 2¹ = 211202021122019 is a prime.

It is a super-2 number, since 2×211202021122021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211202021122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211202021120021) 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, 3406484211615 + ... + 3406484211676.

It is an arithmetic number, because the mean of its divisors is an integer number (54503747386336).

Almost surely, 2^{211202021122021} is an apocalyptic number.

It is an amenable number.

211202021122021 is a deficient number, since it is larger than the sum of its proper divisors (6812968423323).

211202021122021 is an equidigital number, since it uses as much as digits as its factorization.

211202021122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812968423322.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211202021122021 its reverse (120221120202112), we get a palindrome (331423141324133).

The spelling of 211202021122021 in words is "two hundred eleven trillion, two hundred two billion, twenty-one million, one hundred twenty-two thousand, twenty-one".