21612231456006 has 16 divisors (see below), whose sum is σ = 43224953716800. Its totient is φ = 7203995351208.

The previous prime is 21612231455981. The next prime is 21612231456007. The reversal of 21612231456006 is 60065413221612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612231456007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19876516 + ... + 20935623.

It is an arithmetic number, because the mean of its divisors is an integer number (2701559607300).

Almost surely, 2^{21612231456006} is an apocalyptic number.

21612231456006 is an abundant number, since it is smaller than the sum of its proper divisors (21612722260794).

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

21612231456006 is a wasteful number, since it uses less digits than its factorization.

21612231456006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40900403.

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 21612231456006 its reverse (60065413221612), we get a palindrome (81677644677618).

The spelling of 21612231456006 in words is "twenty-one trillion, six hundred twelve billion, two hundred thirty-one million, four hundred fifty-six thousand, six".