211010122221 has 4 divisors (see below), whose sum is σ = 281346829632. Its totient is φ = 140673414812.

The previous prime is 211010122139. The next prime is 211010122241. The reversal of 211010122221 is 122221010112.

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 211010122221 - 2²⁶ = 210943013357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211010122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211010122241) 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, 35168353701 + ... + 35168353706.

It is an arithmetic number, because the mean of its divisors is an integer number (70336707408).

Almost surely, 2^211010122221 is an apocalyptic number.

It is an amenable number.

211010122221 is a deficient number, since it is larger than the sum of its proper divisors (70336707411).

211010122221 is an equidigital number, since it uses as much as digits as its factorization.

211010122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70336707410.

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

Adding to 211010122221 its reverse (122221010112), we get a palindrome (333231132333).

The spelling of 211010122221 in words is "two hundred eleven billion, ten million, one hundred twenty-two thousand, two hundred twenty-one".