1213321210 has 8 divisors (see below), whose sum is σ = 2183978196. Its totient is φ = 485328480.

The previous prime is 1213321163. The next prime is 1213321237. The reversal of 1213321210 is 121233121.

It can be written as a sum of positive squares in 2 ways, for example, as 1111088889 + 102232321 = 33333^2 + 10111^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60666051 + ... + 60666070.

Almost surely, 2^1213321210 is an apocalyptic number.

1213321210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213321210 is a deficient number, since it is larger than the sum of its proper divisors (970656986).

1213321210 is a wasteful number, since it uses less digits than its factorization.

1213321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121332128.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1213321210 is about 34832.7605854029. The cubic root of 1213321210 is about 1066.5763016981.

Adding to 1213321210 its reverse (121233121), we get a palindrome (1334554331).

The spelling of 1213321210 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, two hundred ten".