21101003100 has 54 divisors (see below), whose sum is σ = 66139924760. Its totient is φ = 5626933920.

The previous prime is 21101003087. The next prime is 21101003107. The reversal of 21101003100 is 130010112.

It is a super-2 number, since 2×21101003100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101003107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11721880 + ... + 11723679.

Almost surely, 2^21101003100 is an apocalyptic number.

21101003100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101003100 is an abundant number, since it is smaller than the sum of its proper divisors (45038921660).

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

21101003100 is a wasteful number, since it uses less digits than its factorization.

21101003100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23445579 (or 23445569 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21101003100 its reverse (130010112), we get a palindrome (21231013212).

The spelling of 21101003100 in words is "twenty-one billion, one hundred one million, three thousand, one hundred".