21431224113 has 24 divisors (see below), whose sum is σ = 31065582240. Its totient is φ = 13135824000.

The previous prime is 21431224109. The next prime is 21431224151. The reversal of 21431224113 is 31142213412.

It is not a de Polignac number, because 21431224113 - 2² = 21431224109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21431224153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43053 + ... + 211461.

It is an arithmetic number, because the mean of its divisors is an integer number (1294399260).

Almost surely, 2^21431224113 is an apocalyptic number.

It is an amenable number.

21431224113 is a deficient number, since it is larger than the sum of its proper divisors (9634358127).

21431224113 is a wasteful number, since it uses less digits than its factorization.

21431224113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168689 (or 168676 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 21431224113 its reverse (31142213412), we get a palindrome (52573437525).

The spelling of 21431224113 in words is "twenty-one billion, four hundred thirty-one million, two hundred twenty-four thousand, one hundred thirteen".