21881446345 has 16 divisors (see below), whose sum is σ = 28662147072. Its totient is φ = 15904143360.

The previous prime is 21881446339. The next prime is 21881446397. The reversal of 21881446345 is 54364418812.

It is not a de Polignac number, because 21881446345 - 2¹³ = 21881438153 is a prime.

It is a super-2 number, since 2×21881446345² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21881446295 and 21881446304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28152 + ... + 211081.

It is an arithmetic number, because the mean of its divisors is an integer number (1791384192).

Almost surely, 2^21881446345 is an apocalyptic number.

It is an amenable number.

21881446345 is a deficient number, since it is larger than the sum of its proper divisors (6780700727).

21881446345 is a wasteful number, since it uses less digits than its factorization.

21881446345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240912.

The product of its digits is 737280, while the sum is 46.

The spelling of 21881446345 in words is "twenty-one billion, eight hundred eighty-one million, four hundred forty-six thousand, three hundred forty-five".