21491460445 has 64 divisors (see below), whose sum is σ = 32078592000. Its totient is φ = 13539771648.

The previous prime is 21491460439. The next prime is 21491460451. The reversal of 21491460445 is 54406419412.

It is an interprime number because it is at equal distance from previous prime (21491460439) and next prime (21491460451).

It is not a de Polignac number, because 21491460445 - 2⁵ = 21491460413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21491460398 and 21491460407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20684236 + ... + 20685274.

It is an arithmetic number, because the mean of its divisors is an integer number (501228000).

Almost surely, 2^21491460445 is an apocalyptic number.

It is an amenable number.

21491460445 is a deficient number, since it is larger than the sum of its proper divisors (10587131555).

21491460445 is a wasteful number, since it uses less digits than its factorization.

21491460445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

Adding to 21491460445 its reverse (54406419412), we get a palindrome (75897879857).

The spelling of 21491460445 in words is "twenty-one billion, four hundred ninety-one million, four hundred sixty thousand, four hundred forty-five".