1221691727286 has 48 divisors (see below), whose sum is σ = 2788604910000. Its totient is φ = 385480249344.

The previous prime is 1221691727209. The next prime is 1221691727287. The reversal of 1221691727286 is 6827271961221.

1221691727286 is a `hidden beast` number, since 1 + 221 + 69 + 17 + 272 + 86 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221691727287) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1051411 + ... + 1883838.

It is an arithmetic number, because the mean of its divisors is an integer number (58095935625).

Almost surely, 2^{1221691727286} is an apocalyptic number.

1221691727286 is an abundant number, since it is smaller than the sum of its proper divisors (1566913182714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221691727286 is a wasteful number, since it uses less digits than its factorization.

1221691727286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936493 (or 2936490 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 1221691727286 in words is "one trillion, two hundred twenty-one billion, six hundred ninety-one million, seven hundred twenty-seven thousand, two hundred eighty-six".