121012220 has 48 divisors (see below), whose sum is σ = 299808768. Its totient is φ = 40150080.

The previous prime is 121012219. The next prime is 121012249. The reversal of 121012220 is 22210121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9602 + ... + 18281.

It is an arithmetic number, because the mean of its divisors is an integer number (6246016).

Almost surely, 2^121012220 is an apocalyptic number.

121012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121012220 is an abundant number, since it is smaller than the sum of its proper divisors (178796548).

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

121012220 is a wasteful number, since it uses less digits than its factorization.

121012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27930 (or 27928 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121012220 is about 11000.5554405221. Note that the first 3 decimals coincide. The cubic root of 121012220 is about 494.6253942295.

Adding to 121012220 its reverse (22210121), we get a palindrome (143222341).

The spelling of 121012220 in words is "one hundred twenty-one million, twelve thousand, two hundred twenty".