1213821285 has 8 divisors (see below), whose sum is σ = 1942114080. Its totient is φ = 647371344.

The previous prime is 1213821283. The next prime is 1213821293. The reversal of 1213821285 is 5821283121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213821285 - 2¹ = 1213821283 is a prime.

It is a super-2 number, since 2×1213821285² = 2946724223838102450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213821281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40460695 + ... + 40460724.

It is an arithmetic number, because the mean of its divisors is an integer number (242764260).

Almost surely, 2^1213821285 is an apocalyptic number.

1213821285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213821285 is a deficient number, since it is larger than the sum of its proper divisors (728292795).

1213821285 is an equidigital number, since it uses as much as digits as its factorization.

1213821285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80921427.

The product of its digits is 7680, while the sum is 33.

The square root of 1213821285 is about 34839.9380739978. The cubic root of 1213821285 is about 1066.7228127455.

The spelling of 1213821285 in words is "one billion, two hundred thirteen million, eight hundred twenty-one thousand, two hundred eighty-five".