211020222121 has 4 divisors (see below), whose sum is σ = 211321250244. Its totient is φ = 210719194000.

The previous prime is 211020222067. The next prime is 211020222143. The reversal of 211020222121 is 121222020112.

It is a happy number.

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 186036942400 + 24983279721 = 431320^2 + 158061^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020222121 - 2⁹ = 211020221609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020222095 and 211020222104.

It is not an unprimeable number, because it can be changed into a prime (211020222821) 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, 150513010 + ... + 150514411.

It is an arithmetic number, because the mean of its divisors is an integer number (52830312561).

Almost surely, 2^211020222121 is an apocalyptic number.

It is an amenable number.

211020222121 is a deficient number, since it is larger than the sum of its proper divisors (301028123).

211020222121 is an equidigital number, since it uses as much as digits as its factorization.

211020222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301028122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211020222121 its reverse (121222020112), we get a palindrome (332242242233).

The spelling of 211020222121 in words is "two hundred eleven billion, twenty million, two hundred twenty-two thousand, one hundred twenty-one".