121220020260 has 288 divisors, whose sum is σ = 391622055552. Its totient is φ = 31456097280.

The previous prime is 121220020199. The next prime is 121220020261. The reversal of 121220020260 is 62020022121.

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

It is not an unprimeable number, because it can be changed into a prime (121220020261) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 154027587 + ... + 154028373.

It is an arithmetic number, because the mean of its divisors is an integer number (1359798804).

Almost surely, 2^121220020260 is an apocalyptic number.

121220020260 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 121220020260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195811027776).

121220020260 is an abundant number, since it is smaller than the sum of its proper divisors (270402035292).

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

121220020260 is a wasteful number, since it uses less digits than its factorization.

121220020260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625 (or 1611 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 121220020260 its reverse (62020022121), we get a palindrome (183240042381).

The spelling of 121220020260 in words is "one hundred twenty-one billion, two hundred twenty million, twenty thousand, two hundred sixty".