1212201122220 has 96 divisors (see below), whose sum is σ = 4114137162240. Its totient is φ = 293866937280.

The previous prime is 1212201122203. The next prime is 1212201122243. The reversal of 1212201122220 is 222211022121.

It is a happy number.

1212201122220 is a `hidden beast` number, since 121 + 2 + 201 + 122 + 220 = 666.

It is a super-2 number, since 2×1212201122220² (a number of 25 digits) contains 22 as substring.

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 = 1212201122193 and 1212201122202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102031192 + ... + 102043071.

It is an arithmetic number, because the mean of its divisors is an integer number (42855595440).

Almost surely, 2^{1212201122220} is an apocalyptic number.

1212201122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212201122220 is an abundant number, since it is smaller than the sum of its proper divisors (2901936040020).

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

1212201122220 is a wasteful number, since it uses less digits than its factorization.

1212201122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204074292 (or 204074284 counting only the distinct ones).

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

Adding to 1212201122220 its reverse (222211022121), we get a palindrome (1434412144341).

The spelling of 1212201122220 in words is "one trillion, two hundred twelve billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty".