21066948100 has 36 divisors (see below), whose sum is σ = 49871214288. Its totient is φ = 7660708000.

The previous prime is 21066948059. The next prime is 21066948169. The reversal of 21066948100 is 184966012.

It is a happy number.

It is a super-2 number, since 2×21066948100² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21066948100.

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, 9574786 + ... + 9576985.

It is an arithmetic number, because the mean of its divisors is an integer number (1385311508).

Almost surely, 2^21066948100 is an apocalyptic number.

21066948100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21066948100 is an abundant number, since it is smaller than the sum of its proper divisors (28804266188).

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

21066948100 is a wasteful number, since it uses less digits than its factorization.

21066948100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19151796 (or 19151789 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 21066948100 in words is "twenty-one billion, sixty-six million, nine hundred forty-eight thousand, one hundred".