99890921052 has 144 divisors (see below), whose sum is σ = 284059234368. Its totient is φ = 29367106560.

The previous prime is 99890921041. The next prime is 99890921071. The reversal of 99890921052 is 25012909899.

It is a super-2 number, since 2×99890921052² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99890921052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10899352 + ... + 10908512.

It is an arithmetic number, because the mean of its divisors is an integer number (1972633572).

Almost surely, 2^99890921052 is an apocalyptic number.

99890921052 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

99890921052 is the 158028-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99890921052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142029617184).

99890921052 is an abundant number, since it is smaller than the sum of its proper divisors (184168313316).

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

99890921052 is a wasteful number, since it uses less digits than its factorization.

99890921052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10220 (or 10215 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The spelling of 99890921052 in words is "ninety-nine billion, eight hundred ninety million, nine hundred twenty-one thousand, fifty-two".