991001120021102 has 8 divisors (see below), whose sum is σ = 1486501826557800. Its totient is φ = 495500511168504.

The previous prime is 991001120021089. The next prime is 991001120021123. The reversal of 991001120021102 is 201120021100199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×991001120021102² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11521049 + ... + 45986267.

It is an arithmetic number, because the mean of its divisors is an integer number (185812728319725).

Almost surely, 2^{991001120021102} is an apocalyptic number.

991001120021102 is a deficient number, since it is larger than the sum of its proper divisors (495500706536698).

991001120021102 is a wasteful number, since it uses less digits than its factorization.

991001120021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48842050.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 991001120021102 in words is "nine hundred ninety-one trillion, one billion, one hundred twenty million, twenty-one thousand, one hundred two".