21343031421 has 8 divisors (see below), whose sum is σ = 28923889824. Its totient is φ = 13995430320.

The previous prime is 21343031407. The next prime is 21343031449. The reversal of 21343031421 is 12413034312.

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 21343031421 - 2¹¹ = 21343029373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21343031391 and 21343031400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343031461) 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, 58314111 + ... + 58314476.

It is an arithmetic number, because the mean of its divisors is an integer number (3615486228).

Almost surely, 2^21343031421 is an apocalyptic number.

It is an amenable number.

21343031421 is a deficient number, since it is larger than the sum of its proper divisors (7580858403).

21343031421 is a wasteful number, since it uses less digits than its factorization.

21343031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116628651.

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

Adding to 21343031421 its reverse (12413034312), we get a palindrome (33756065733).

The spelling of 21343031421 in words is "twenty-one billion, three hundred forty-three million, thirty-one thousand, four hundred twenty-one".