21102001124 has 24 divisors (see below), whose sum is σ = 37732480800. Its totient is φ = 10322988480.

The previous prime is 21102001099. The next prime is 21102001139. The reversal of 21102001124 is 42110020112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21102001099 and 21102001108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162089 + ... + 261680.

It is an arithmetic number, because the mean of its divisors is an integer number (1572186700).

Almost surely, 2^21102001124 is an apocalyptic number.

It is an amenable number.

21102001124 is a deficient number, since it is larger than the sum of its proper divisors (16630479676).

21102001124 is a wasteful number, since it uses less digits than its factorization.

21102001124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424043 (or 424041 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102001124 its reverse (42110020112), we get a palindrome (63212021236).

The spelling of 21102001124 in words is "twenty-one billion, one hundred two million, one thousand, one hundred twenty-four".