111212202221211 has 16 divisors (see below), whose sum is σ = 182502075440384. Its totient is φ = 58661381391264.

The previous prime is 111212202221207. The next prime is 111212202221243. The reversal of 111212202221211 is 112122202212111.

It is not a de Polignac number, because 111212202221211 - 2² = 111212202221207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (111212202221411) 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, 203685351781 + ... + 203685352326.

It is an arithmetic number, because the mean of its divisors is an integer number (11406379715024).

Almost surely, 2^{111212202221211} is an apocalyptic number.

111212202221211 is a deficient number, since it is larger than the sum of its proper divisors (71289873219173).

111212202221211 is a wasteful number, since it uses less digits than its factorization.

111212202221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407370704130.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111212202221211 its reverse (112122202212111), we get a palindrome (223334404433322).

The spelling of 111212202221211 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred two million, two hundred twenty-one thousand, two hundred eleven".