1212200020 has 12 divisors (see below), whose sum is σ = 2545620084. Its totient is φ = 484880000.

The previous prime is 1212199951. The next prime is 1212200021. The reversal of 1212200020 is 200022121.

It can be written as a sum of positive squares in 2 ways, for example, as 546250384 + 665949636 = 23372^2 + 25806^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212200021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30304981 + ... + 30305020.

It is an arithmetic number, because the mean of its divisors is an integer number (212135007).

Almost surely, 2^1212200020 is an apocalyptic number.

1212200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212200020 is an abundant number, since it is smaller than the sum of its proper divisors (1333420064).

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

1212200020 is a wasteful number, since it uses less digits than its factorization.

1212200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610010 (or 60610008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1212200020 is about 34816.6629647357. The cubic root of 1212200020 is about 1066.2476711571.

Adding to 1212200020 its reverse (200022121), we get a palindrome (1412222141).

The spelling of 1212200020 in words is "one billion, two hundred twelve million, two hundred thousand, twenty".