1221450340455 has 12 divisors (see below), whose sum is σ = 2117180590200. Its totient is φ = 651440181552.

The previous prime is 1221450340309. The next prime is 1221450340457. The reversal of 1221450340455 is 5540430541221.

1221450340455 is a `hidden beast` number, since 1 + 2 + 214 + 50 + 340 + 4 + 55 = 666.

It is not a de Polignac number, because 1221450340455 - 2⁸ = 1221450340199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221450340457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13571670405 + ... + 13571670494.

It is an arithmetic number, because the mean of its divisors is an integer number (176431715850).

Almost surely, 2^{1221450340455} is an apocalyptic number.

1221450340455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221450340455 is a deficient number, since it is larger than the sum of its proper divisors (895730249745).

1221450340455 is a wasteful number, since it uses less digits than its factorization.

1221450340455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27143340910 (or 27143340907 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 1221450340455 its reverse (5540430541221), we get a palindrome (6761880881676).

The spelling of 1221450340455 in words is "one trillion, two hundred twenty-one billion, four hundred fifty million, three hundred forty thousand, four hundred fifty-five".