21011320104 has 32 divisors (see below), whose sum is σ = 52534336320. Its totient is φ = 7002968576.

The previous prime is 21011320067. The next prime is 21011320133. The reversal of 21011320104 is 40102311012.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 185464 + ... + 276440.

It is an arithmetic number, because the mean of its divisors is an integer number (1641698010).

Almost surely, 2^21011320104 is an apocalyptic number.

21011320104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21011320104 is an abundant number, since it is smaller than the sum of its proper divisors (31523016216).

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

21011320104 is a wasteful number, since it uses less digits than its factorization.

21011320104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100609 (or 100605 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011320104 its reverse (40102311012), we get a palindrome (61113631116).

The spelling of 21011320104 in words is "twenty-one billion, eleven million, three hundred twenty thousand, one hundred four".