21052220100 has 72 divisors (see below), whose sum is σ = 62060402880. Its totient is φ = 5507998080.

The previous prime is 21052220087. The next prime is 21052220159. The reversal of 21052220100 is 102225012.

It is a super-2 number, since 2×21052220100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21052220100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 646120 + ... + 677919.

It is an arithmetic number, because the mean of its divisors is an integer number (861950040).

Almost surely, 2^21052220100 is an apocalyptic number.

21052220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21052220100 is an abundant number, since it is smaller than the sum of its proper divisors (41008182780).

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

21052220100 is a wasteful number, since it uses less digits than its factorization.

21052220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324109 (or 1324102 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21052220100 its reverse (102225012), we get a palindrome (21154445112).

The spelling of 21052220100 in words is "twenty-one billion, fifty-two million, two hundred twenty thousand, one hundred".