15612221106 has 48 divisors (see below), whose sum is σ = 35342783424. Its totient is φ = 4971380832.

The previous prime is 15612221069. The next prime is 15612221117. The reversal of 15612221106 is 60112221651.

15612221106 is a `hidden beast` number, since 15 + 612 + 2 + 21 + 10 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15612221106.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301860 + ... + 349776.

It is an arithmetic number, because the mean of its divisors is an integer number (736307988).

Almost surely, 2^15612221106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15612221106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17671391712).

15612221106 is an abundant number, since it is smaller than the sum of its proper divisors (19730562318).

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

15612221106 is a wasteful number, since it uses less digits than its factorization.

15612221106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48735 (or 48732 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 15612221106 its reverse (60112221651), we get a palindrome (75724442757).

The spelling of 15612221106 in words is "fifteen billion, six hundred twelve million, two hundred twenty-one thousand, one hundred six".