21431404445 has 48 divisors (see below), whose sum is σ = 29857840320. Its totient is φ = 14715613440.

The previous prime is 21431404411. The next prime is 21431404447. The reversal of 21431404445 is 54440413412.

It is not a de Polignac number, because 21431404445 - 2¹⁰ = 21431403421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431404447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3525929 + ... + 3532001.

It is an arithmetic number, because the mean of its divisors is an integer number (622038340).

Almost surely, 2^21431404445 is an apocalyptic number.

It is an amenable number.

21431404445 is a deficient number, since it is larger than the sum of its proper divisors (8426435875).

21431404445 is a wasteful number, since it uses less digits than its factorization.

21431404445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6426 (or 6415 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 21431404445 its reverse (54440413412), we get a palindrome (75871817857).

The spelling of 21431404445 in words is "twenty-one billion, four hundred thirty-one million, four hundred four thousand, four hundred forty-five".