1221103232551 has 8 divisors (see below), whose sum is σ = 1263249832320. Its totient is φ = 1178959272288.

The previous prime is 1221103232533. The next prime is 1221103232603. The reversal of 1221103232551 is 1552323011221.

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 1221103232551 - 2⁷ = 1221103232423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221103232051) 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, 305290 + ... + 1592296.

It is an arithmetic number, because the mean of its divisors is an integer number (157906229040).

Almost surely, 2^{1221103232551} is an apocalyptic number.

1221103232551 is a deficient number, since it is larger than the sum of its proper divisors (42146599769).

1221103232551 is a wasteful number, since it uses less digits than its factorization.

1221103232551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319753.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1221103232551 its reverse (1552323011221), we get a palindrome (2773426243772).

The spelling of 1221103232551 in words is "one trillion, two hundred twenty-one billion, one hundred three million, two hundred thirty-two thousand, five hundred fifty-one".