91021410972 has 36 divisors (see below), whose sum is σ = 230900722416. Its totient is φ = 30232493760.

The previous prime is 91021410971. The next prime is 91021410983. The reversal of 91021410972 is 27901412019.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91021410971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4488768 + ... + 4508999.

It is an arithmetic number, because the mean of its divisors is an integer number (6413908956).

Almost surely, 2^91021410972 is an apocalyptic number.

It is an amenable number.

91021410972 is an abundant number, since it is smaller than the sum of its proper divisors (139879311444).

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

91021410972 is a wasteful number, since it uses less digits than its factorization.

91021410972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8998058 (or 8998053 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 91021410972 in words is "ninety-one billion, twenty-one million, four hundred ten thousand, nine hundred seventy-two".