21041010100 has 72 divisors (see below), whose sum is σ = 50440521600. Its totient is φ = 7554393600.

The previous prime is 21041010079. The next prime is 21041010103. The reversal of 21041010100 is 101014012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041010103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34165 + ... + 207964.

It is an arithmetic number, because the mean of its divisors is an integer number (700562800).

Almost surely, 2^21041010100 is an apocalyptic number.

21041010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041010100 is an abundant number, since it is smaller than the sum of its proper divisors (29399511500).

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

21041010100 is a wasteful number, since it uses less digits than its factorization.

21041010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242233 (or 242226 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21041010100 its reverse (101014012), we get a palindrome (21142024112).

The spelling of 21041010100 in words is "twenty-one billion, forty-one million, ten thousand, one hundred".