211100221122021 has 32 divisors (see below), whose sum is σ = 389910942336000. Its totient is φ = 109662452529840.

The previous prime is 211100221122001. The next prime is 211100221122073. The reversal of 211100221122021 is 120221122001112.

211100221122021 is a `hidden beast` number, since 211 + 1 + 0 + 0 + 2 + 211 + 220 + 21 = 666.

It is not a de Polignac number, because 211100221122021 - 2¹¹ = 211100221119973 is a prime.

It is a super-2 number, since 2×211100221122021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211100221121985 and 211100221122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100221122001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50769651871 + ... + 50769656028.

It is an arithmetic number, because the mean of its divisors is an integer number (12184716948000).

Almost surely, 2^{211100221122021} is an apocalyptic number.

211100221122021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211100221122021 is a deficient number, since it is larger than the sum of its proper divisors (178810721213979).

211100221122021 is a wasteful number, since it uses less digits than its factorization.

211100221122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101539307926 (or 101539307920 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211100221122021 its reverse (120221122001112), we get a palindrome (331321343123133).

The spelling of 211100221122021 in words is "two hundred eleven trillion, one hundred billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-one".