1216212423 has 8 divisors (see below), whose sum is σ = 1692121728. Its totient is φ = 775555704.

The previous prime is 1216212409. The next prime is 1216212451. The reversal of 1216212423 is 3242126121.

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

It is not a de Polignac number, because 1216212423 - 2⁹ = 1216211911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216212393 and 1216212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216212493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8813065 + ... + 8813202.

It is an arithmetic number, because the mean of its divisors is an integer number (211515216).

Almost surely, 2^1216212423 is an apocalyptic number.

1216212423 is a deficient number, since it is larger than the sum of its proper divisors (475909305).

1216212423 is a wasteful number, since it uses less digits than its factorization.

1216212423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17626293.

The product of its digits is 1152, while the sum is 24.

The square root of 1216212423 is about 34874.2372389705. The cubic root of 1216212423 is about 1067.4228082695.

Adding to 1216212423 its reverse (3242126121), we get a palindrome (4458338544).

The spelling of 1216212423 in words is "one billion, two hundred sixteen million, two hundred twelve thousand, four hundred twenty-three".