21043112421331 has 24 divisors (see below), whose sum is σ = 28467732521312. Its totient is φ = 15135905030400.

The previous prime is 21043112421299. The next prime is 21043112421347. The reversal of 21043112421331 is 13312421134012.

It is not a de Polignac number, because 21043112421331 - 2⁵ = 21043112421299 is a prime.

It is a super-2 number, since 2×21043112421331² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21043112421331.

It is not an unprimeable number, because it can be changed into a prime (21043112424331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 955538550 + ... + 955560571.

Almost surely, 2^{21043112421331} is an apocalyptic number.

21043112421331 is a deficient number, since it is larger than the sum of its proper divisors (7424620099981).

21043112421331 is a wasteful number, since it uses less digits than its factorization.

21043112421331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911099163 (or 1911099152 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21043112421331 its reverse (13312421134012), we get a palindrome (34355533555343).

The spelling of 21043112421331 in words is "twenty-one trillion, forty-three billion, one hundred twelve million, four hundred twenty-one thousand, three hundred thirty-one".