1245211212 has 48 divisors (see below), whose sum is σ = 3323597312. Its totient is φ = 355449600.

The previous prime is 1245211211. The next prime is 1245211241. The reversal of 1245211212 is 2121125421.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1245211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94713 + ... + 107055.

Almost surely, 2^1245211212 is an apocalyptic number.

1245211212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1245211212 is an abundant number, since it is smaller than the sum of its proper divisors (2078386100).

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

1245211212 is a wasteful number, since it uses less digits than its factorization.

1245211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13558 (or 13556 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 1245211212 is about 35287.5503825358. The cubic root of 1245211212 is about 1075.8399671247.

Adding to 1245211212 its reverse (2121125421), we get a palindrome (3366336633).

The spelling of 1245211212 in words is "one billion, two hundred forty-five million, two hundred eleven thousand, two hundred twelve".