21100030320 has 80 divisors (see below), whose sum is σ = 65432633472. Its totient is φ = 5624736000.

The previous prime is 21100030307. The next prime is 21100030331. The reversal of 21100030320 is 2303000112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21100030320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21100030296 and 21100030305.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 766719 + ... + 793761.

Almost surely, 2^21100030320 is an apocalyptic number.

21100030320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100030320 is an abundant number, since it is smaller than the sum of its proper divisors (44332603152).

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

21100030320 is a wasteful number, since it uses less digits than its factorization.

21100030320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30310 (or 30304 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21100030320 its reverse (2303000112), we get a palindrome (23403030432).

The spelling of 21100030320 in words is "twenty-one billion, one hundred million, thirty thousand, three hundred twenty".