21431210544 has 30 divisors (see below), whose sum is σ = 59977624356. Its totient is φ = 7143736800.

The previous prime is 21431210533. The next prime is 21431210579. The reversal of 21431210544 is 44501213412.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 74413782 + ... + 74414069.

Almost surely, 2^21431210544 is an apocalyptic number.

21431210544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21431210544 is an abundant number, since it is smaller than the sum of its proper divisors (38546413812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431210544 is a wasteful number, since it uses less digits than its factorization.

21431210544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148827865 (or 148827856 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21431210544 its reverse (44501213412), we get a palindrome (65932423956).

The spelling of 21431210544 in words is "twenty-one billion, four hundred thirty-one million, two hundred ten thousand, five hundred forty-four".