21342013431 has 8 divisors (see below), whose sum is σ = 28466202864. Its totient is φ = 14222916480.

The previous prime is 21342013417. The next prime is 21342013439. The reversal of 21342013431 is 13431024312.

It is a happy number.

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

It is not a de Polignac number, because 21342013431 - 2¹⁰ = 21342012407 is a prime.

It is a super-2 number, since 2×21342013431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342013439) 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, 1263330 + ... + 1280111.

It is an arithmetic number, because the mean of its divisors is an integer number (3558275358).

Almost surely, 2^21342013431 is an apocalyptic number.

21342013431 is a deficient number, since it is larger than the sum of its proper divisors (7124189433).

21342013431 is a wasteful number, since it uses less digits than its factorization.

21342013431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546241.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21342013431 its reverse (13431024312), we get a palindrome (34773037743).

The spelling of 21342013431 in words is "twenty-one billion, three hundred forty-two million, thirteen thousand, four hundred thirty-one".