21305541446 has 16 divisors (see below), whose sum is σ = 36540166176. Its totient is φ = 9126851136.

The previous prime is 21305541443. The next prime is 21305541449. The reversal of 21305541446 is 64414550312.

It is an interprime number because it is at equal distance from previous prime (21305541443) and next prime (21305541449).

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, 308831 + ... + 371466.

It is an arithmetic number, because the mean of its divisors is an integer number (2283760386).

Almost surely, 2^21305541446 is an apocalyptic number.

21305541446 is a deficient number, since it is larger than the sum of its proper divisors (15234624730).

21305541446 is a wasteful number, since it uses less digits than its factorization.

21305541446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682543.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21305541446 in words is "twenty-one billion, three hundred five million, five hundred forty-one thousand, four hundred forty-six".