21044022100 has 36 divisors (see below), whose sum is σ = 45673923904. Its totient is φ = 8416061280.

The previous prime is 21044022089. The next prime is 21044022121. The reversal of 21044022100 is 122044012.

It is a super-3 number, since 3×21044022100³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 638629 + ... + 670771.

Almost surely, 2^21044022100 is an apocalyptic number.

21044022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044022100 is an abundant number, since it is smaller than the sum of its proper divisors (24629901804).

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

21044022100 is a wasteful number, since it uses less digits than its factorization.

21044022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38704 (or 38697 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21044022100 its reverse (122044012), we get a palindrome (21166066112).

It can be divided in two parts, 2104 and 4022100, that added together give a palindrome (4024204).

The spelling of 21044022100 in words is "twenty-one billion, forty-four million, twenty-two thousand, one hundred".