21431212041 has 8 divisors (see below), whose sum is σ = 28575738880. Its totient is φ = 14287079952.

The previous prime is 21431212009. The next prime is 21431212069. The reversal of 21431212041 is 14021213412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21431212041 - 2⁵ = 21431212009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21431211999 and 21431212017.

It is not an unprimeable number, because it can be changed into a prime (21431212081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68415 + ... + 218043.

It is an arithmetic number, because the mean of its divisors is an integer number (3571967360).

Almost surely, 2^21431212041 is an apocalyptic number.

It is an amenable number.

21431212041 is a deficient number, since it is larger than the sum of its proper divisors (7144526839).

21431212041 is a wasteful number, since it uses less digits than its factorization.

21431212041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197375.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21431212041 its reverse (14021213412), we get a palindrome (35452425453).

The spelling of 21431212041 in words is "twenty-one billion, four hundred thirty-one million, two hundred twelve thousand, forty-one".