1212321009 has 8 divisors (see below), whose sum is σ = 1620833920. Its totient is φ = 806011056.

The previous prime is 1212320987. The next prime is 1212321013. The reversal of 1212321009 is 9001232121.

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

It is not a de Polignac number, because 1212321009 - 2²⁴ = 1195543793 is a prime.

It is a super-3 number, since 3×1212321009³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212321109) 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, 549454 + ... + 551655.

It is an arithmetic number, because the mean of its divisors is an integer number (202604240).

Almost surely, 2^1212321009 is an apocalyptic number.

It is an amenable number.

1212321009 is a deficient number, since it is larger than the sum of its proper divisors (408512911).

1212321009 is a wasteful number, since it uses less digits than its factorization.

1212321009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101479.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1212321009 is about 34818.4004371252. The cubic root of 1212321009 is about 1066.2831438365.

The spelling of 1212321009 in words is "one billion, two hundred twelve million, three hundred twenty-one thousand, nine".