21000100024 has 16 divisors (see below), whose sum is σ = 39520487520. Its totient is φ = 10461303360.

The previous prime is 21000100003. The next prime is 21000100031. The reversal of 21000100024 is 42000100012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4841029 + ... + 4845364.

It is an arithmetic number, because the mean of its divisors is an integer number (2470030470).

Almost surely, 2^21000100024 is an apocalyptic number.

It is an amenable number.

21000100024 is a deficient number, since it is larger than the sum of its proper divisors (18520387496).

21000100024 is a wasteful number, since it uses less digits than its factorization.

21000100024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9686670 (or 9686666 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000100024 its reverse (42000100012), we get a palindrome (63000200036).

The spelling of 21000100024 in words is "twenty-one billion, one hundred thousand, twenty-four".