1216021466 has 16 divisors (see below), whose sum is σ = 1990548000. Its totient is φ = 552544080.

The previous prime is 1216021439. The next prime is 1216021487. The reversal of 1216021466 is 6641206121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69080 + ... + 84876.

It is an arithmetic number, because the mean of its divisors is an integer number (124409250).

Almost surely, 2^1216021466 is an apocalyptic number.

1216021466 is a deficient number, since it is larger than the sum of its proper divisors (774526534).

1216021466 is a wasteful number, since it uses less digits than its factorization.

1216021466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19309.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1216021466 is about 34871.4993368510. The cubic root of 1216021466 is about 1067.3669401437.

Adding to 1216021466 its reverse (6641206121), we get a palindrome (7857227587).

The spelling of 1216021466 in words is "one billion, two hundred sixteen million, twenty-one thousand, four hundred sixty-six".