1221311446 has 8 divisors (see below), whose sum is σ = 1863017640. Its totient is φ = 600305568.

The previous prime is 1221311381. The next prime is 1221311447. The reversal of 1221311446 is 6441131221.

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

It is a super-2 number, since 2×1221311446² = 2983203296261221832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221311446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221311447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5174931 + ... + 5175166.

It is an arithmetic number, because the mean of its divisors is an integer number (232877205).

Almost surely, 2^1221311446 is an apocalyptic number.

1221311446 is a deficient number, since it is larger than the sum of its proper divisors (641706194).

1221311446 is a wasteful number, since it uses less digits than its factorization.

1221311446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350158.

The product of its digits is 1152, while the sum is 25.

The square root of 1221311446 is about 34947.2666456191. The cubic root of 1221311446 is about 1068.9124670946.

Adding to 1221311446 its reverse (6441131221), we get a palindrome (7662442667).

The spelling of 1221311446 in words is "one billion, two hundred twenty-one million, three hundred eleven thousand, four hundred forty-six".