124223630021 has 4 divisors (see below), whose sum is σ = 128507203500. Its totient is φ = 119940056544.

The previous prime is 124223630017. The next prime is 124223630023. The reversal of 124223630021 is 120036322421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56994400225 + 67229229796 = 238735^2 + 259286^2 .

It is a cyclic number.

It is not a de Polignac number, because 124223630021 - 2² = 124223630017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124223630023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141786696 + ... + 2141786753.

It is an arithmetic number, because the mean of its divisors is an integer number (32126800875).

Almost surely, 2^124223630021 is an apocalyptic number.

It is an amenable number.

124223630021 is a deficient number, since it is larger than the sum of its proper divisors (4283573479).

124223630021 is an equidigital number, since it uses as much as digits as its factorization.

124223630021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283573478.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 124223630021 its reverse (120036322421), we get a palindrome (244259952442).

The spelling of 124223630021 in words is "one hundred twenty-four billion, two hundred twenty-three million, six hundred thirty thousand, twenty-one".