111121220222121 has 32 divisors (see below), whose sum is σ = 148629120127488. Its totient is φ = 73847418024960.

The previous prime is 111121220222041. The next prime is 111121220222123. The reversal of 111121220222121 is 121222022121111.

It is not a de Polignac number, because 111121220222121 - 2¹⁰ = 111121220221097 is a prime.

It is a super-2 number, since 2×111121220222121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111121220222123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6713047981 + ... + 6713064533.

It is an arithmetic number, because the mean of its divisors is an integer number (4644660003984).

Almost surely, 2^{111121220222121} is an apocalyptic number.

It is an amenable number.

111121220222121 is a deficient number, since it is larger than the sum of its proper divisors (37507899905367).

111121220222121 is a wasteful number, since it uses less digits than its factorization.

111121220222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441.

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

Adding to 111121220222121 its reverse (121222022121111), we get a palindrome (232343242343232).

The spelling of 111121220222121 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".