1221151466 has 16 divisors (see below), whose sum is σ = 1914591168. Its totient is φ = 583044000.

The previous prime is 1221151423. The next prime is 1221151469. The reversal of 1221151466 is 6641511221.

It is not an unprimeable number, because it can be changed into a prime (1221151469) 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, 5561 + ... + 49731.

It is an arithmetic number, because the mean of its divisors is an integer number (119661948).

Almost surely, 2^1221151466 is an apocalyptic number.

1221151466 is a deficient number, since it is larger than the sum of its proper divisors (693439702).

1221151466 is a wasteful number, since it uses less digits than its factorization.

1221151466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44797.

The product of its digits is 2880, while the sum is 29.

The square root of 1221151466 is about 34944.9776935113. The cubic root of 1221151466 is about 1068.8657926546.

Adding to 1221151466 its reverse (6641511221), we get a palindrome (7862662687).

The spelling of 1221151466 in words is "one billion, two hundred twenty-one million, one hundred fifty-one thousand, four hundred sixty-six".