1221357337 has 8 divisors (see below), whose sum is σ = 1256992704. Its totient is φ = 1186050768.

The previous prime is 1221357307. The next prime is 1221357343. The reversal of 1221357337 is 7337531221.

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

It is not a de Polignac number, because 1221357337 - 2²⁷ = 1087139609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221357307) 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, 74653 + ... + 89530.

It is an arithmetic number, because the mean of its divisors is an integer number (157124088).

Almost surely, 2^1221357337 is an apocalyptic number.

It is an amenable number.

1221357337 is a deficient number, since it is larger than the sum of its proper divisors (35635367).

1221357337 is a wasteful number, since it uses less digits than its factorization.

1221357337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164399.

The product of its digits is 26460, while the sum is 34.

The square root of 1221357337 is about 34947.9232144057. The cubic root of 1221357337 is about 1068.9258551205.

Adding to 1221357337 its reverse (7337531221), we get a palindrome (8558888558).

The spelling of 1221357337 in words is "one billion, two hundred twenty-one million, three hundred fifty-seven thousand, three hundred thirty-seven".