21343431011 has 8 divisors (see below), whose sum is σ = 24394562400. Its totient is φ = 18292817088.

The previous prime is 21343431001. The next prime is 21343431037. The reversal of 21343431011 is 11013434312.

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

It is not a de Polignac number, because 21343431011 - 2¹⁸ = 21343168867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343431001) 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, 36536 + ... + 209813.

It is an arithmetic number, because the mean of its divisors is an integer number (3049320300).

Almost surely, 2^21343431011 is an apocalyptic number.

21343431011 is a deficient number, since it is larger than the sum of its proper divisors (3051131389).

21343431011 is a wasteful number, since it uses less digits than its factorization.

21343431011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258733.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21343431011 its reverse (11013434312), we get a palindrome (32356865323).

The spelling of 21343431011 in words is "twenty-one billion, three hundred forty-three million, four hundred thirty-one thousand, eleven".