211220044121 has 4 divisors (see below), whose sum is σ = 211221622500. Its totient is φ = 211218465744.

The previous prime is 211220044099. The next prime is 211220044127. The reversal of 211220044121 is 121440022112.

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 36801050896 + 174418993225 = 191836^2 + 417635^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220044121 - 2¹⁴ = 211220027737 is a prime.

It is a super-2 number, since 2×211220044121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220044093 and 211220044102.

It is not an unprimeable number, because it can be changed into a prime (211220044127) 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, 567746 + ... + 863003.

It is an arithmetic number, because the mean of its divisors is an integer number (52805405625).

Almost surely, 2^211220044121 is an apocalyptic number.

It is an amenable number.

211220044121 is a deficient number, since it is larger than the sum of its proper divisors (1578379).

211220044121 is a wasteful number, since it uses less digits than its factorization.

211220044121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578378.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211220044121 its reverse (121440022112), we get a palindrome (332660066233).

The spelling of 211220044121 in words is "two hundred eleven billion, two hundred twenty million, forty-four thousand, one hundred twenty-one".