15223621842 has 128 divisors (see below), whose sum is σ = 39922848000. Its totient is φ = 4239267840.

The previous prime is 15223621837. The next prime is 15223621849. The reversal of 15223621842 is 24812632251.

15223621842 is a `hidden beast` number, since 1 + 5 + 2 + 23 + 621 + 8 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 15223621797 and 15223621806.

It is not an unprimeable number, because it can be changed into a prime (15223621849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1764034 + ... + 1772642.

It is an arithmetic number, because the mean of its divisors is an integer number (311897250).

Almost surely, 2^15223621842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15223621842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19961424000).

15223621842 is an abundant number, since it is smaller than the sum of its proper divisors (24699226158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15223621842 is a wasteful number, since it uses less digits than its factorization.

15223621842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8873 (or 8867 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The spelling of 15223621842 in words is "fifteen billion, two hundred twenty-three million, six hundred twenty-one thousand, eight hundred forty-two".