21521870303 has 8 divisors (see below), whose sum is σ = 21567939072. Its totient is φ = 21475837656.

The previous prime is 21521870299. The next prime is 21521870309. The reversal of 21521870303 is 30307812512.

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 21521870303 - 2² = 21521870299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21521870303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521870309) 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, 1417076 + ... + 1432182.

It is an arithmetic number, because the mean of its divisors is an integer number (2695992384).

Almost surely, 2^21521870303 is an apocalyptic number.

21521870303 is a deficient number, since it is larger than the sum of its proper divisors (46068769).

21521870303 is a wasteful number, since it uses less digits than its factorization.

21521870303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18061.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21521870303 in words is "twenty-one billion, five hundred twenty-one million, eight hundred seventy thousand, three hundred three".