15204021105 has 48 divisors (see below), whose sum is σ = 30474892224. Its totient is φ = 6415758720.

The previous prime is 15204021097. The next prime is 15204021109. The reversal of 15204021105 is 50112040251.

It is not a de Polignac number, because 15204021105 - 2³ = 15204021097 is a prime.

It is a super-2 number, since 2×15204021105² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15204021109) 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 47 ways as a sum of consecutive naturals, for example, 786051 + ... + 805160.

It is an arithmetic number, because the mean of its divisors is an integer number (634893588).

Almost surely, 2^15204021105 is an apocalyptic number.

15204021105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15204021105 is an abundant number, since it is smaller than the sum of its proper divisors (15270871119).

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

15204021105 is a wasteful number, since it uses less digits than its factorization.

15204021105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591246 (or 1591239 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 15204021105 its reverse (50112040251), we get a palindrome (65316061356).

The spelling of 15204021105 in words is "fifteen billion, two hundred four million, twenty-one thousand, one hundred five".