211020221121 has 16 divisors (see below), whose sum is σ = 292098216960. Its totient is φ = 135345714560.

The previous prime is 211020221099. The next prime is 211020221123. The reversal of 211020221121 is 121122020112.

It is a cyclic number.

It is not a de Polignac number, because 211020221121 - 2¹³ = 211020212929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211020221121.

It is not an unprimeable number, because it can be changed into a prime (211020221123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4291425 + ... + 4340318.

It is an arithmetic number, because the mean of its divisors is an integer number (18256138560).

Almost surely, 2^211020221121 is an apocalyptic number.

It is an amenable number.

211020221121 is a deficient number, since it is larger than the sum of its proper divisors (81077995839).

211020221121 is a wasteful number, since it uses less digits than its factorization.

211020221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8632056.

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

Adding to 211020221121 its reverse (121122020112), we get a palindrome (332142241233).

The spelling of 211020221121 in words is "two hundred eleven billion, twenty million, two hundred twenty-one thousand, one hundred twenty-one".