211221100401 has 4 divisors (see below), whose sum is σ = 281628133872. Its totient is φ = 140814066932.

The previous prime is 211221100397. The next prime is 211221100403. The reversal of 211221100401 is 104001122112.

211221100401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211221100401 - 2² = 211221100397 is a prime.

It is a super-2 number, since 2×211221100401² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221100403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35203516731 + ... + 35203516736.

It is an arithmetic number, because the mean of its divisors is an integer number (70407033468).

Almost surely, 2^211221100401 is an apocalyptic number.

It is an amenable number.

211221100401 is a deficient number, since it is larger than the sum of its proper divisors (70407033471).

211221100401 is an equidigital number, since it uses as much as digits as its factorization.

211221100401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70407033470.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221100401 its reverse (104001122112), we get a palindrome (315222222513).

The spelling of 211221100401 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred thousand, four hundred one".