21111023524 has 24 divisors (see below), whose sum is σ = 38564846208. Its totient is φ = 10092836160.

The previous prime is 21111023497. The next prime is 21111023537. The reversal of 21111023524 is 42532011112.

It is a junction number, because it is equal to n+sod(n) for n = 21111023495 and 21111023504.

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, 215664 + ... + 297880.

It is an arithmetic number, because the mean of its divisors is an integer number (1606868592).

Almost surely, 2^21111023524 is an apocalyptic number.

It is an amenable number.

21111023524 is a deficient number, since it is larger than the sum of its proper divisors (17453822684).

21111023524 is a wasteful number, since it uses less digits than its factorization.

21111023524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85035 (or 85033 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21111023524 its reverse (42532011112), we get a palindrome (63643034636).

The spelling of 21111023524 in words is "twenty-one billion, one hundred eleven million, twenty-three thousand, five hundred twenty-four".