121220210021220 has 72 divisors (see below), whose sum is σ = 371341910754360. Its totient is φ = 32005335974400.

The previous prime is 121220210021189. The next prime is 121220210021233. The reversal of 121220210021220 is 22120012022121.

It is a happy number.

121220210021220 is a `hidden beast` number, since 1 + 2 + 1 + 220 + 210 + 0 + 212 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 71216417196324 + 50003792824896 = 8438982^2 + 7071336^2 .

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 = 121220210021193 and 121220210021202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3333870985 + ... + 3333907344.

It is an arithmetic number, because the mean of its divisors is an integer number (5157526538255).

Almost surely, 2^{121220210021220} is an apocalyptic number.

121220210021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220210021220 is an abundant number, since it is smaller than the sum of its proper divisors (250121700733140).

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

121220210021220 is a wasteful number, since it uses less digits than its factorization.

121220210021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667778445 (or 6667778440 counting only the distinct ones).

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

Adding to 121220210021220 its reverse (22120012022121), we get a palindrome (143340222043341).

The spelling of 121220210021220 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred ten million, twenty-one thousand, two hundred twenty".