1221354235451 has 8 divisors (see below), whose sum is σ = 1396071371520. Its totient is φ = 1046696589288.

The previous prime is 1221354235429. The next prime is 1221354235469. The reversal of 1221354235451 is 1545324531221.

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

It is a de Polignac number, because none of the positive numbers 2^k-1221354235451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221354235411) 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, 14828471 + ... + 14910608.

It is an arithmetic number, because the mean of its divisors is an integer number (174508921440).

Almost surely, 2^{1221354235451} is an apocalyptic number.

1221354235451 is a deficient number, since it is larger than the sum of its proper divisors (174717136069).

1221354235451 is an equidigital number, since it uses as much as digits as its factorization.

1221354235451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29744953.

The product of its digits is 144000, while the sum is 38.

Adding to 1221354235451 its reverse (1545324531221), we get a palindrome (2766678766672).

The spelling of 1221354235451 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-four million, two hundred thirty-five thousand, four hundred fifty-one".