15531210012 has 12 divisors (see below), whose sum is σ = 36239490056. Its totient is φ = 5177070000.

The previous prime is 15531210001. The next prime is 15531210017. The reversal of 15531210012 is 21001213551.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15531210017) 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, 647133739 + ... + 647133762.

Almost surely, 2^15531210012 is an apocalyptic number.

15531210012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15531210012 is an abundant number, since it is smaller than the sum of its proper divisors (20708280044).

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

15531210012 is a wasteful number, since it uses less digits than its factorization.

15531210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294267508 (or 1294267506 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 15531210012 its reverse (21001213551), we get a palindrome (36532423563).

The spelling of 15531210012 in words is "fifteen billion, five hundred thirty-one million, two hundred ten thousand, twelve".