21110124772 has 48 divisors (see below), whose sum is σ = 41409998784. Its totient is φ = 9332928000.

The previous prime is 21110124769. The next prime is 21110124823. The reversal of 21110124772 is 27742101112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110124772.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579448 + ... + 614800.

It is an arithmetic number, because the mean of its divisors is an integer number (862708308).

Almost surely, 2^21110124772 is an apocalyptic number.

21110124772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21110124772 is a deficient number, since it is larger than the sum of its proper divisors (20299874012).

21110124772 is a wasteful number, since it uses less digits than its factorization.

21110124772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35740 (or 35738 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 21110124772 its reverse (27742101112), we get a palindrome (48852225884).

The spelling of 21110124772 in words is "twenty-one billion, one hundred ten million, one hundred twenty-four thousand, seven hundred seventy-two".