21305541445 has 8 divisors (see below), whose sum is σ = 25583358240. Its totient is φ = 17033294160.

The previous prime is 21305541443. The next prime is 21305541449. The reversal of 21305541445 is 54414550312.

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

It is not a de Polignac number, because 21305541445 - 2¹ = 21305541443 is a prime.

It is a super-2 number, since 2×21305541445² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21305541445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305541443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1383955 + ... + 1399264.

It is an arithmetic number, because the mean of its divisors is an integer number (3197919780).

Almost surely, 2^21305541445 is an apocalyptic number.

It is an amenable number.

21305541445 is a deficient number, since it is larger than the sum of its proper divisors (4277816795).

21305541445 is a wasteful number, since it uses less digits than its factorization.

21305541445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784755.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 21305541445 in words is "twenty-one billion, three hundred five million, five hundred forty-one thousand, four hundred forty-five".