1213210817 has 8 divisors (see below), whose sum is σ = 1493182656. Its totient is φ = 959902992.

The previous prime is 1213210783. The next prime is 1213210829. The reversal of 1213210817 is 7180123121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213210817 - 2⁶ = 1213210753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213210837) 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, 6665903 + ... + 6666084.

It is an arithmetic number, because the mean of its divisors is an integer number (186647832).

Almost surely, 2^1213210817 is an apocalyptic number.

It is an amenable number.

1213210817 is a deficient number, since it is larger than the sum of its proper divisors (279971839).

1213210817 is a wasteful number, since it uses less digits than its factorization.

1213210817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13332007.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1213210817 is about 34831.1759347858. The cubic root of 1213210817 is about 1066.5439535373.

Adding to 1213210817 its reverse (7180123121), we get a palindrome (8393333938).

The spelling of 1213210817 in words is "one billion, two hundred thirteen million, two hundred ten thousand, eight hundred seventeen".