1221211662 has 32 divisors (see below), whose sum is σ = 2804699520. Its totient is φ = 350586720.

The previous prime is 1221211627. The next prime is 1221211709. The reversal of 1221211662 is 2661121221.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485673 + ... + 488180.

It is an arithmetic number, because the mean of its divisors is an integer number (87646860).

Almost surely, 2^1221211662 is an apocalyptic number.

1221211662 is an abundant number, since it is smaller than the sum of its proper divisors (1583487858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221211662 is a wasteful number, since it uses less digits than its factorization.

1221211662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973888.

The product of its digits is 576, while the sum is 24.

The square root of 1221211662 is about 34945.8389797698. The cubic root of 1221211662 is about 1068.8833554194.

Adding to 1221211662 its reverse (2661121221), we get a palindrome (3882332883).

The spelling of 1221211662 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, six hundred sixty-two".