121210211220 has 240 divisors, whose sum is σ = 398032766208. Its totient is φ = 27558101760.

The previous prime is 121210211189. The next prime is 121210211233. The reversal of 121210211220 is 22112012121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121210211220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 28377685 + ... + 28381955.

Almost surely, 2^121210211220 is an apocalyptic number.

121210211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121210211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199016383104).

121210211220 is an abundant number, since it is smaller than the sum of its proper divisors (276822554988).

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

121210211220 is a wasteful number, since it uses less digits than its factorization.

121210211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508 (or 4485 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121210211220 its reverse (22112012121), we get a palindrome (143322223341).

The spelling of 121210211220 in words is "one hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, two hundred twenty".