1212021110091 has 16 divisors (see below), whose sum is σ = 1784180039040. Its totient is φ = 725708147520.

The previous prime is 1212021110059. The next prime is 1212021110101. The reversal of 1212021110091 is 1900111202121.

It is not a de Polignac number, because 1212021110091 - 2⁵ = 1212021110059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212021110051) 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 15 ways as a sum of consecutive naturals, for example, 221249746 + ... + 221255223.

It is an arithmetic number, because the mean of its divisors is an integer number (111511252440).

Almost surely, 2^{1212021110091} is an apocalyptic number.

1212021110091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212021110091 is a deficient number, since it is larger than the sum of its proper divisors (572158928949).

1212021110091 is a wasteful number, since it uses less digits than its factorization.

1212021110091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442505066.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 1212021110091 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred ten thousand, ninety-one".