91021000002 has 8 divisors (see below), whose sum is σ = 182042000016. Its totient is φ = 30340333332.

The previous prime is 91020999997. The next prime is 91021000013. The reversal of 91021000002 is 20000012019.

It is a happy number.

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

91021000002 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7585083328 + ... + 7585083339.

It is an arithmetic number, because the mean of its divisors is an integer number (22755250002).

Almost surely, 2^91021000002 is an apocalyptic number.

91021000002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91021000002 is a wasteful number, since it uses less digits than its factorization.

91021000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15170166672.

The product of its (nonzero) digits is 36, while the sum is 15.

The spelling of 91021000002 in words is "ninety-one billion, twenty-one million, two", and thus it is an aban number and an uban number.