1221145044435 has 12 divisors (see below), whose sum is σ = 2116651410432. Its totient is φ = 651277357008.

The previous prime is 1221145044421. The next prime is 1221145044487. The reversal of 1221145044435 is 5344405411221.

1221145044435 is a `hidden beast` number, since 1 + 2 + 2 + 114 + 504 + 4 + 4 + 35 = 666.

It is not a de Polignac number, because 1221145044435 - 2⁸ = 1221145044179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221145044435.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13568278227 + ... + 13568278316.

It is an arithmetic number, because the mean of its divisors is an integer number (176387617536).

Almost surely, 2^{1221145044435} is an apocalyptic number.

1221145044435 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221145044435 is a deficient number, since it is larger than the sum of its proper divisors (895506365997).

1221145044435 is a wasteful number, since it uses less digits than its factorization.

1221145044435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27136556554 (or 27136556551 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 1221145044435 in words is "one trillion, two hundred twenty-one billion, one hundred forty-five million, forty-four thousand, four hundred thirty-five".