1212023312220 has 96 divisors (see below), whose sum is σ = 3878621107200. Its totient is φ = 277023435264.

The previous prime is 1212023312189. The next prime is 1212023312237. The reversal of 1212023312220 is 222133202121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 18989521 + ... + 19053239.

It is an arithmetic number, because the mean of its divisors is an integer number (40402303200).

Almost surely, 2^{1212023312220} is an apocalyptic number.

1212023312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212023312220 is an abundant number, since it is smaller than the sum of its proper divisors (2666597794980).

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

1212023312220 is a wasteful number, since it uses less digits than its factorization.

1212023312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109027 (or 109025 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1212023312220 its reverse (222133202121), we get a palindrome (1434156514341).

The spelling of 1212023312220 in words is "one trillion, two hundred twelve billion, twenty-three million, three hundred twelve thousand, two hundred twenty".