124804000021 has 4 divisors (see below), whose sum is σ = 125431156000. Its totient is φ = 124176844044.

The previous prime is 124803999919. The next prime is 124804000031. The reversal of 124804000021 is 120000408421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120000408421 = 113 ⋅1061950517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124804000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 124803999956 and 124804000001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124804000031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313577691 + ... + 313578088.

It is an arithmetic number, because the mean of its divisors is an integer number (31357789000).

Almost surely, 2^124804000021 is an apocalyptic number.

It is an amenable number.

124804000021 is a deficient number, since it is larger than the sum of its proper divisors (627155979).

124804000021 is an equidigital number, since it uses as much as digits as its factorization.

124804000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627155978.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 124804000021 its reverse (120000408421), we get a palindrome (244804408442).

The spelling of 124804000021 in words is "one hundred twenty-four billion, eight hundred four million, twenty-one", and thus it is an aban number.