211101122221001 has 4 divisors (see below), whose sum is σ = 211102316428932. Its totient is φ = 211099928013072.

The previous prime is 211101122220997. The next prime is 211101122221021. The reversal of 211101122221001 is 100122221101112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14934514830400 + 196166607390601 = 3864520^2 + 14005949^2 .

It is a cyclic number.

It is not a de Polignac number, because 211101122221001 - 2² = 211101122220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211101122221021) 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, 596838770 + ... + 597192363.

It is an arithmetic number, because the mean of its divisors is an integer number (52775579107233).

Almost surely, 2^{211101122221001} is an apocalyptic number.

It is an amenable number.

211101122221001 is a deficient number, since it is larger than the sum of its proper divisors (1194207931).

211101122221001 is a wasteful number, since it uses less digits than its factorization.

211101122221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194207930.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211101122221001 its reverse (100122221101112), we get a palindrome (311223343322113).

The spelling of 211101122221001 in words is "two hundred eleven trillion, one hundred one billion, one hundred twenty-two million, two hundred twenty-one thousand, one".