1213220000 has 60 divisors (see below), whose sum is σ = 2984752386. Its totient is φ = 485280000.

The previous prime is 1213219993. The next prime is 1213220003. The reversal of 1213220000 is 223121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 7463824 + 1205756176 = 2732^2 + 34724^2 .

It is not an unprimeable number, because it can be changed into a prime (1213220003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10331 + ... + 50330.

Almost surely, 2^1213220000 is an apocalyptic number.

1213220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213220000 is an abundant number, since it is smaller than the sum of its proper divisors (1771532386).

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

1213220000 is an frugal number, since it uses more digits than its factorization.

1213220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60691 (or 60668 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1213220000 is about 34831.3077560978. The cubic root of 1213220000 is about 1066.5466444816.

Adding to 1213220000 its reverse (223121), we get a palindrome (1213443121).

The spelling of 1213220000 in words is "one billion, two hundred thirteen million, two hundred twenty thousand".