21118433490 has 384 divisors, whose sum is σ = 71165952000. Its totient is φ = 4216665600.

The previous prime is 21118433467. The next prime is 21118433491. The reversal of 21118433490 is 9433481112.

21118433490 is a `hidden beast` number, since 21 + 118 + 4 + 33 + 490 = 666.

It is not an unprimeable number, because it can be changed into a prime (21118433491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 42321261 + ... + 42321759.

It is an arithmetic number, because the mean of its divisors is an integer number (185328000).

Almost surely, 2^21118433490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21118433490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35582976000).

21118433490 is an abundant number, since it is smaller than the sum of its proper divisors (50047518510).

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

21118433490 is a wasteful number, since it uses less digits than its factorization.

21118433490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21118433490 in words is "twenty-one billion, one hundred eighteen million, four hundred thirty-three thousand, four hundred ninety".