1212213120 has 64 divisors (see below), whose sum is σ = 3863935440. Its totient is φ = 323256320.

The previous prime is 1212213097. The next prime is 1212213133. The reversal of 1212213120 is 213122121.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1212213120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313761 + ... + 317600.

Almost surely, 2^1212213120 is an apocalyptic number.

1212213120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212213120 is an abundant number, since it is smaller than the sum of its proper divisors (2651722320).

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

1212213120 is an equidigital number, since it uses as much as digits as its factorization.

1212213120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631383 (or 631371 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1212213120 is about 34816.8510925385. The cubic root of 1212213120 is about 1066.2515120508.

Adding to 1212213120 its reverse (213122121), we get a palindrome (1425335241).

Subtracting from 1212213120 its reverse (213122121), we obtain a palindrome (999090999).

The spelling of 1212213120 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, one hundred twenty".