1221136649495 has 16 divisors (see below), whose sum is σ = 1677797283648. Its totient is φ = 835803048960.

The previous prime is 1221136649471. The next prime is 1221136649531. The reversal of 1221136649495 is 5949466311221.

It is not a de Polignac number, because 1221136649495 - 2¹⁴ = 1221136633111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32226554 + ... + 32264423.

It is an arithmetic number, because the mean of its divisors is an integer number (104862330228).

Almost surely, 2^{1221136649495} is an apocalyptic number.

1221136649495 is a deficient number, since it is larger than the sum of its proper divisors (456660634153).

1221136649495 is an equidigital number, since it uses as much as digits as its factorization.

1221136649495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64491530.

The product of its digits is 2799360, while the sum is 53.

The spelling of 1221136649495 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-six million, six hundred forty-nine thousand, four hundred ninety-five".