211020221122221 has 8 divisors (see below), whose sum is σ = 321554622662464. Its totient is φ = 120582983498400.

The previous prime is 211020221122157. The next prime is 211020221122231. The reversal of 211020221122221 is 122221122020112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211020221122221 - 2⁶ = 211020221122157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10048581958201 = 211020221122221 / (2 + 1 + 1 + 0 + 2 + 0 + 2 + 2 + 1 + 1 + 2 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020221122231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5024290979080 + ... + 5024290979121.

It is an arithmetic number, because the mean of its divisors is an integer number (40194327832808).

Almost surely, 2^{211020221122221} is an apocalyptic number.

211020221122221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211020221122221 is a deficient number, since it is larger than the sum of its proper divisors (110534401540243).

211020221122221 is a wasteful number, since it uses less digits than its factorization.

211020221122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10048581958211.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211020221122221 its reverse (122221122020112), we get a palindrome (333241343142333).

The spelling of 211020221122221 in words is "two hundred eleven trillion, twenty billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".