211221211121101 has 4 divisors (see below), whose sum is σ = 222338116969600. Its totient is φ = 200104305272604.

The previous prime is 211221211121093. The next prime is 211221211121147. The reversal of 211221211121101 is 101121112122112.

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 211221211121101 - 2³ = 211221211121093 is a prime.

It is a super-2 number, since 2×211221211121101² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11116905848479 = 211221211121101 / (2 + 1 + 1 + 2 + 2 + 1 + 2 + 1 + 1 + 1 + 2 + 1 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221211121171) 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, 5558452924221 + ... + 5558452924258.

It is an arithmetic number, because the mean of its divisors is an integer number (55584529242400).

Almost surely, 2^{211221211121101} is an apocalyptic number.

It is an amenable number.

211221211121101 is a deficient number, since it is larger than the sum of its proper divisors (11116905848499).

211221211121101 is a wasteful number, since it uses less digits than its factorization.

211221211121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11116905848498.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211221211121101 its reverse (101121112122112), we get a palindrome (312342323243213).

The spelling of 211221211121101 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred one".