21101325124 has 24 divisors (see below), whose sum is σ = 40289004000. Its totient is φ = 9590402880.

The previous prime is 21101325103. The next prime is 21101325169. The reversal of 21101325124 is 42152310112.

It is a super-4 number, since 4×21101325124⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21101325095 and 21101325104.

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, 449727 + ... + 494425.

It is an arithmetic number, because the mean of its divisors is an integer number (1678708500).

Almost surely, 2^21101325124 is an apocalyptic number.

It is an amenable number.

21101325124 is a deficient number, since it is larger than the sum of its proper divisors (19187678876).

21101325124 is a wasteful number, since it uses less digits than its factorization.

21101325124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55443 (or 55441 counting only the distinct ones).

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

Adding to 21101325124 its reverse (42152310112), we get a palindrome (63253635236).

The spelling of 21101325124 in words is "twenty-one billion, one hundred one million, three hundred twenty-five thousand, one hundred twenty-four".