91021121103 has 16 divisors (see below), whose sum is σ = 132410880000. Its totient is φ = 55157431680.

The previous prime is 91021121101. The next prime is 91021121117. The reversal of 91021121103 is 30112112019.

It is a happy number.

It is not a de Polignac number, because 91021121103 - 2¹ = 91021121101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91021121103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91021121101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102898 + ... + 438896.

It is an arithmetic number, because the mean of its divisors is an integer number (8275680000).

Almost surely, 2^91021121103 is an apocalyptic number.

91021121103 is a deficient number, since it is larger than the sum of its proper divisors (41389758897).

91021121103 is a wasteful number, since it uses less digits than its factorization.

91021121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344222.

The product of its (nonzero) digits is 108, while the sum is 21.

The spelling of 91021121103 in words is "ninety-one billion, twenty-one million, one hundred twenty-one thousand, one hundred three".