21431000042246 has 16 divisors (see below), whose sum is σ = 33015730047120. Its totient is φ = 10425763810080.

The previous prime is 21431000042183. The next prime is 21431000042299. The reversal of 21431000042246 is 64224000013412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4429556 + ... + 7904616.

It is an arithmetic number, because the mean of its divisors is an integer number (2063483127945).

Almost surely, 2^{21431000042246} is an apocalyptic number.

21431000042246 is a deficient number, since it is larger than the sum of its proper divisors (11584730004874).

21431000042246 is a wasteful number, since it uses less digits than its factorization.

21431000042246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558439.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21431000042246 its reverse (64224000013412), we get a palindrome (85655000055658).

The spelling of 21431000042246 in words is "twenty-one trillion, four hundred thirty-one billion, forty-two thousand, two hundred forty-six".