1221357336 has 64 divisors (see below), whose sum is σ = 3124293120. Its totient is φ = 397770240.

The previous prime is 1221357307. The next prime is 1221357343. The reversal of 1221357336 is 6337531221.

It is a junction number, because it is equal to n+sod(n) for n = 1221357297 and 1221357306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189381 + ... + 195723.

It is an arithmetic number, because the mean of its divisors is an integer number (48817080).

Almost surely, 2^1221357336 is an apocalyptic number.

It is an amenable number.

1221357336 is an abundant number, since it is smaller than the sum of its proper divisors (1902935784).

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

1221357336 is a wasteful number, since it uses less digits than its factorization.

1221357336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6536 (or 6532 counting only the distinct ones).

The product of its digits is 22680, while the sum is 33.

The square root of 1221357336 is about 34947.9232000987. The cubic root of 1221357336 is about 1068.9258548288.

Adding to 1221357336 its reverse (6337531221), we get a palindrome (7558888557).

The spelling of 1221357336 in words is "one billion, two hundred twenty-one million, three hundred fifty-seven thousand, three hundred thirty-six".