211201220101 has 4 divisors (see below), whose sum is σ = 211202781804. Its totient is φ = 211199658400.

The previous prime is 211201220059. The next prime is 211201220147. The reversal of 211201220101 is 101022102112.

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 24641150625 + 186560069476 = 156975^2 + 431926^2 .

It is a cyclic number.

It is not a de Polignac number, because 211201220101 - 2⁹ = 211201219589 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 (211201226101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556510 + ... + 855631.

It is an arithmetic number, because the mean of its divisors is an integer number (52800695451).

Almost surely, 2^211201220101 is an apocalyptic number.

It is an amenable number.

211201220101 is a deficient number, since it is larger than the sum of its proper divisors (1561703).

211201220101 is a wasteful number, since it uses less digits than its factorization.

211201220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561702.

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

Adding to 211201220101 its reverse (101022102112), we get a palindrome (312223322213).

The spelling of 211201220101 in words is "two hundred eleven billion, two hundred one million, two hundred twenty thousand, one hundred one".