21011024100 has 72 divisors (see below), whose sum is σ = 66318442848. Its totient is φ = 5093580800.

The previous prime is 21011024071. The next prime is 21011024119. The reversal of 21011024100 is 142011012.

It is a happy number.

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

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, 3180189 + ... + 3186788.

It is an arithmetic number, because the mean of its divisors is an integer number (921089484).

Almost surely, 2^21011024100 is an apocalyptic number.

21011024100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011024100 is an abundant number, since it is smaller than the sum of its proper divisors (45307418748).

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

21011024100 is a wasteful number, since it uses less digits than its factorization.

21011024100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6367005 (or 6366998 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011024100 its reverse (142011012), we get a palindrome (21153035112).

It can be divided in two parts, 2101 and 1024100, that added together give a palindrome (1026201).

The spelling of 21011024100 in words is "twenty-one billion, eleven million, twenty-four thousand, one hundred".