21377445563 has 8 divisors (see below), whose sum is σ = 22051942032. Its totient is φ = 20708040096.

The previous prime is 21377445559. The next prime is 21377445641. The reversal of 21377445563 is 36554477312.

It is a happy number.

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 21377445563 - 2² = 21377445559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21377445553) 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, 1264220 + ... + 1281017.

It is an arithmetic number, because the mean of its divisors is an integer number (2756492754).

Almost surely, 2^21377445563 is an apocalyptic number.

21377445563 is a deficient number, since it is larger than the sum of its proper divisors (674496469).

21377445563 is a wasteful number, since it uses less digits than its factorization.

21377445563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545501.

The product of its digits is 2116800, while the sum is 47.

The spelling of 21377445563 in words is "twenty-one billion, three hundred seventy-seven million, four hundred forty-five thousand, five hundred sixty-three".