121121113220 has 24 divisors (see below), whose sum is σ = 258524083608. Its totient is φ = 47654208000.

The previous prime is 121121113207. The next prime is 121121113241. The reversal of 121121113220 is 22311121121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2243727424 + 118877385796 = 47368^2 + 344786^2 .

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, 49638581 + ... + 49641020.

It is an arithmetic number, because the mean of its divisors is an integer number (10771836817).

Almost surely, 2^121121113220 is an apocalyptic number.

121121113220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121113220 is an abundant number, since it is smaller than the sum of its proper divisors (137402970388).

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

121121113220 is a wasteful number, since it uses less digits than its factorization.

121121113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99279671 (or 99279669 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121121113220 its reverse (22311121121), we get a palindrome (143432234341).

The spelling of 121121113220 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred thirteen thousand, two hundred twenty".