21231045445 has 8 divisors (see below), whose sum is σ = 25485318144. Its totient is φ = 16979460624.

The previous prime is 21231045431. The next prime is 21231045461. The reversal of 21231045445 is 54454013212.

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

It is a cyclic number.

It is not a de Polignac number, because 21231045445 - 2⁷ = 21231045317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654549 + ... + 686218.

It is an arithmetic number, because the mean of its divisors is an integer number (3185664768).

Almost surely, 2^21231045445 is an apocalyptic number.

It is an amenable number.

21231045445 is a deficient number, since it is larger than the sum of its proper divisors (4254272699).

21231045445 is a wasteful number, since it uses less digits than its factorization.

21231045445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343939.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21231045445 its reverse (54454013212), we get a palindrome (75685058657).

The spelling of 21231045445 in words is "twenty-one billion, two hundred thirty-one million, forty-five thousand, four hundred forty-five".