121210021121220 has 144 divisors (see below), whose sum is σ = 368745849239040. Its totient is φ = 32228264901888.

The previous prime is 121210021121177. The next prime is 121210021121243. The reversal of 121210021121220 is 22121120012121.

121210021121220 is a `hidden beast` number, since 1 + 2 + 1 + 210 + 0 + 211 + 21 + 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 = 121210021121193 and 121210021121202.

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, 83794137 + ... + 85228383.

It is an arithmetic number, because the mean of its divisors is an integer number (2560735064160).

Almost surely, 2^{121210021121220} is an apocalyptic number.

121210021121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210021121220 is an abundant number, since it is smaller than the sum of its proper divisors (247535828117820).

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

121210021121220 is a wasteful number, since it uses less digits than its factorization.

121210021121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435634 (or 1435629 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121210021121220 its reverse (22121120012121), we get a palindrome (143331141133341).

The spelling of 121210021121220 in words is "one hundred twenty-one trillion, two hundred ten billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty".