121222210220 has 24 divisors (see below), whose sum is σ = 254660380800. Its totient is φ = 48471028992.

The previous prime is 121222210201. The next prime is 121222210223. The reversal of 121222210220 is 22012222121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121222210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060205 + ... + 1168964.

It is an arithmetic number, because the mean of its divisors is an integer number (10610849200).

Almost surely, 2^121222210220 is an apocalyptic number.

121222210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222210220 is an abundant number, since it is smaller than the sum of its proper divisors (133438170580).

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

121222210220 is a wasteful number, since it uses less digits than its factorization.

121222210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231897 (or 2231895 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121222210220 its reverse (22012222121), we get a palindrome (143234432341).

The spelling of 121222210220 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty".