1221303351 has 8 divisors (see below), whose sum is σ = 1640291184. Its totient is φ = 808258880.

The previous prime is 1221303331. The next prime is 1221303371. The reversal of 1221303351 is 1533031221.

It is an interprime number because it is at equal distance from previous prime (1221303331) and next prime (1221303371).

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

It is a cyclic number.

It is not a de Polignac number, because 1221303351 - 2⁶ = 1221303287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221303331) 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, 1485360 + ... + 1486181.

It is an arithmetic number, because the mean of its divisors is an integer number (205036398).

Almost surely, 2^1221303351 is an apocalyptic number.

1221303351 is a deficient number, since it is larger than the sum of its proper divisors (418987833).

1221303351 is a wasteful number, since it uses less digits than its factorization.

1221303351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971681.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1221303351 is about 34947.1508280718. The cubic root of 1221303351 is about 1068.9101054624.

Adding to 1221303351 its reverse (1533031221), we get a palindrome (2754334572).

The spelling of 1221303351 in words is "one billion, two hundred twenty-one million, three hundred three thousand, three hundred fifty-one".