121210211212220 has 48 divisors (see below), whose sum is σ = 286039883062080. Its totient is φ = 42808689977856.

The previous prime is 121210211212201. The next prime is 121210211212241. The reversal of 121210211212220 is 22212112012121.

It is a super-2 number, since 2×121210211212220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121210211212192 and 121210211212201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10134627065 + ... + 10134639024.

It is an arithmetic number, because the mean of its divisors is an integer number (5959164230460).

Almost surely, 2^{121210211212220} is an apocalyptic number.

121210211212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210211212220 is an abundant number, since it is smaller than the sum of its proper divisors (164829671849860).

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

121210211212220 is a wasteful number, since it uses less digits than its factorization.

121210211212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20269266134 (or 20269266132 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121210211212220 its reverse (22212112012121), we get a palindrome (143422323224341).

The spelling of 121210211212220 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty".