21521741303 has 4 divisors (see below), whose sum is σ = 21522760320. Its totient is φ = 21520722288.

The previous prime is 21521741281. The next prime is 21521741321. The reversal of 21521741303 is 30314712512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21521741303 - 2¹⁶ = 21521675767 is a prime.

It is a super-2 number, since 2×21521741303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521741383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477143 + ... + 520296.

It is an arithmetic number, because the mean of its divisors is an integer number (5380690080).

Almost surely, 2^21521741303 is an apocalyptic number.

21521741303 is a deficient number, since it is larger than the sum of its proper divisors (1019017).

21521741303 is an equidigital number, since it uses as much as digits as its factorization.

21521741303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019016.

The product of its (nonzero) digits is 5040, while the sum is 29.

The spelling of 21521741303 in words is "twenty-one billion, five hundred twenty-one million, seven hundred forty-one thousand, three hundred three".