1216102421 has 8 divisors (see below), whose sum is σ = 1251492000. Its totient is φ = 1180845648.

The previous prime is 1216102399. The next prime is 1216102451. The reversal of 1216102421 is 1242016121.

It is a happy number.

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 1216102421 - 2¹⁸ = 1215840277 is a prime.

It is a super-2 number, since 2×1216102421² = 2957810196724122482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216102393 and 1216102402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216102451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14471 + ... + 51396.

It is an arithmetic number, because the mean of its divisors is an integer number (156436500).

Almost surely, 2^1216102421 is an apocalyptic number.

It is an amenable number.

1216102421 is a deficient number, since it is larger than the sum of its proper divisors (35389579).

1216102421 is an equidigital number, since it uses as much as digits as its factorization.

1216102421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66403.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1216102421 is about 34872.6600792082. The cubic root of 1216102421 is about 1067.3906257928.

Adding to 1216102421 its reverse (1242016121), we get a palindrome (2458118542).

The spelling of 1216102421 in words is "one billion, two hundred sixteen million, one hundred two thousand, four hundred twenty-one".