211101002221 has 4 divisors (see below), whose sum is σ = 223518708252. Its totient is φ = 198683296192.

The previous prime is 211101002207. The next prime is 211101002257. The reversal of 211101002221 is 122200101112.

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 156963346596 + 54137655625 = 396186^2 + 232675^2 .

It is a cyclic number.

It is not a de Polignac number, because 211101002221 - 2³⁷ = 73662048749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211101008221) 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, 6208852990 + ... + 6208853023.

It is an arithmetic number, because the mean of its divisors is an integer number (55879677063).

Almost surely, 2^211101002221 is an apocalyptic number.

It is an amenable number.

211101002221 is a deficient number, since it is larger than the sum of its proper divisors (12417706031).

211101002221 is a wasteful number, since it uses less digits than its factorization.

211101002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12417706030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211101002221 its reverse (122200101112), we get a palindrome (333301103333).

The spelling of 211101002221 in words is "two hundred eleven billion, one hundred one million, two thousand, two hundred twenty-one".