111021020121220 has 24 divisors (see below), whose sum is σ = 254339064278208. Its totient is φ = 40371280044000.

The previous prime is 111021020121181. The next prime is 111021020121371. The reversal of 111021020121220 is 22121020120111.

It is a super-2 number, since 2×111021020121220² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111021020121194 and 111021020121203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252320500056 + ... + 252320500495.

It is an arithmetic number, because the mean of its divisors is an integer number (10597461011592).

Almost surely, 2^{111021020121220} is an apocalyptic number.

111021020121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111021020121220 is an abundant number, since it is smaller than the sum of its proper divisors (143318044156988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111021020121220 is a wasteful number, since it uses less digits than its factorization.

111021020121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504641000571 (or 504641000569 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111021020121220 its reverse (22121020120111), we get a palindrome (133142040241331).

The spelling of 111021020121220 in words is "one hundred eleven trillion, twenty-one billion, twenty million, one hundred twenty-one thousand, two hundred twenty".