18910421082 has 64 divisors (see below), whose sum is σ = 48236409600. Its totient is φ = 5379359040.

The previous prime is 18910421081. The next prime is 18910421107. The reversal of 18910421082 is 28012401981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18910421081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22669 + ... + 195792.

It is an arithmetic number, because the mean of its divisors is an integer number (753693900).

Almost surely, 2^18910421082 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18910421082, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24118204800).

18910421082 is an abundant number, since it is smaller than the sum of its proper divisors (29325988518).

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

18910421082 is a wasteful number, since it uses less digits than its factorization.

18910421082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218708 (or 218702 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 18910421082 in words is "eighteen billion, nine hundred ten million, four hundred twenty-one thousand, eighty-two".