1212221200020 has 96 divisors (see below), whose sum is σ = 3400384931328. Its totient is φ = 322672315392.

The previous prime is 1212221199979. The next prime is 1212221200037. The reversal of 1212221200020 is 200021222121.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 87184389 + ... + 87198291.

It is an arithmetic number, because the mean of its divisors is an integer number (35420676368).

Almost surely, 2^{1212221200020} is an apocalyptic number.

1212221200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212221200020 is an abundant number, since it is smaller than the sum of its proper divisors (2188163731308).

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

1212221200020 is a wasteful number, since it uses less digits than its factorization.

1212221200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16449 (or 16447 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1212221200020 its reverse (200021222121), we get a palindrome (1412242422141).

The spelling of 1212221200020 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred thousand, twenty".