1212513320 has 16 divisors (see below), whose sum is σ = 2728155060. Its totient is φ = 485005312.

The previous prime is 1212513319. The next prime is 1212513343. The reversal of 1212513320 is 233152121.

It can be written as a sum of positive squares in 2 ways, for example, as 1163764996 + 48748324 = 34114^2 + 6982^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1212513292 and 1212513301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15156377 + ... + 15156456.

Almost surely, 2^1212513320 is an apocalyptic number.

1212513320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212513320 is an abundant number, since it is smaller than the sum of its proper divisors (1515641740).

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

1212513320 is a wasteful number, since it uses less digits than its factorization.

1212513320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30312844 (or 30312840 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1212513320 is about 34821.1619564885. The cubic root of 1212513320 is about 1066.3395225058.

Adding to 1212513320 its reverse (233152121), we get a palindrome (1445665441).

The spelling of 1212513320 in words is "one billion, two hundred twelve million, five hundred thirteen thousand, three hundred twenty".