211121201122021 has 4 divisors (see below), whose sum is σ = 211258026270112. Its totient is φ = 210984375973932.

The previous prime is 211121201121989. The next prime is 211121201122037. The reversal of 211121201122021 is 120221102121112.

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 211121201122021 - 2⁵ = 211121201121989 is a prime.

It is a super-2 number, since 2×211121201122021² (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 211121201122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121201122081) 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, 68412571731 + ... + 68412574816.

It is an arithmetic number, because the mean of its divisors is an integer number (52814506567528).

Almost surely, 2^{211121201122021} is an apocalyptic number.

It is an amenable number.

211121201122021 is a deficient number, since it is larger than the sum of its proper divisors (136825148091).

211121201122021 is a wasteful number, since it uses less digits than its factorization.

211121201122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136825148090.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211121201122021 its reverse (120221102121112), we get a palindrome (331342303243133).

Subtracting from 211121201122021 its reverse (120221102121112), we obtain a palindrome (90900099000909).

The spelling of 211121201122021 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred one million, one hundred twenty-two thousand, twenty-one".