1210212120 has 64 divisors (see below), whose sum is σ = 3909921120. Its totient is φ = 297897984.

The previous prime is 1210212109. The next prime is 1210212149. The reversal of 1210212120 is 212120121.

It is a super-2 number, since 2×1210212120² = 2929226750789788800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1210212096 and 1210212105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386329 + ... + 389448.

Almost surely, 2^1210212120 is an apocalyptic number.

1210212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210212120 is an abundant number, since it is smaller than the sum of its proper divisors (2699709000).

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

1210212120 is a wasteful number, since it uses less digits than its factorization.

1210212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775804 (or 775800 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1210212120 is about 34788.1031388606. The cubic root of 1210212120 is about 1065.6645018739.

Adding to 1210212120 its reverse (212120121), we get a palindrome (1422332241).

The spelling of 1210212120 in words is "one billion, two hundred ten million, two hundred twelve thousand, one hundred twenty".