1212421356 has 36 divisors (see below), whose sum is σ = 3197983152. Its totient is φ = 386568864.

The previous prime is 1212421349. The next prime is 1212421393. The reversal of 1212421356 is 6531242121.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 731311 + ... + 732966.

Almost surely, 2^1212421356 is an apocalyptic number.

It is an amenable number.

1212421356 is an abundant number, since it is smaller than the sum of its proper divisors (1985561796).

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

1212421356 is a wasteful number, since it uses less digits than its factorization.

1212421356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464310 (or 1464305 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1212421356 is about 34819.8414126199. The cubic root of 1212421356 is about 1066.3125627120.

Adding to 1212421356 its reverse (6531242121), we get a palindrome (7743663477).

The spelling of 1212421356 in words is "one billion, two hundred twelve million, four hundred twenty-one thousand, three hundred fifty-six".