121222211220 has 144 divisors (see below), whose sum is σ = 422247833280. Its totient is φ = 27840499200.

The previous prime is 121222211167. The next prime is 121222211281. The reversal of 121222211220 is 22112222121.

It is a happy number.

121222211220 is a `hidden beast` number, since 1 + 212 + 22 + 211 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121222211193 and 121222211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1573521 + ... + 1648760.

It is an arithmetic number, because the mean of its divisors is an integer number (2932276620).

Almost surely, 2^121222211220 is an apocalyptic number.

121222211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222211220 is an abundant number, since it is smaller than the sum of its proper divisors (301025622060).

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

121222211220 is a wasteful number, since it uses less digits than its factorization.

121222211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222326 (or 3222321 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121222211220 its reverse (22112222121), we get a palindrome (143334433341).

The spelling of 121222211220 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty".