21577532803 has 2 divisors, whose sum is σ = 21577532804. Its totient is φ = 21577532802.

The previous prime is 21577532729. The next prime is 21577532881. The reversal of 21577532803 is 30823577512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21577532803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21577532803.

It is not a weakly prime, because it can be changed into another prime (21577572803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10788766401 + 10788766402.

It is an arithmetic number, because the mean of its divisors is an integer number (10788766402).

Almost surely, 2^21577532803 is an apocalyptic number.

21577532803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21577532803 is an equidigital number, since it uses as much as digits as its factorization.

21577532803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 21577532803 in words is "twenty-one billion, five hundred seventy-seven million, five hundred thirty-two thousand, eight hundred three".