21001203319 has 4 divisors (see below), whose sum is σ = 21001551696. Its totient is φ = 21000854944.

The previous prime is 21001203313. The next prime is 21001203323. The reversal of 21001203319 is 91330210012.

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 21001203319 - 2¹⁵ = 21001170551 is a prime.

It is a super-2 number, since 2×21001203319² (a number of 21 digits) contains 22 as substring.

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 21001203319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001203313) 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, 57874 + ... + 212959.

It is an arithmetic number, because the mean of its divisors is an integer number (5250387924).

Almost surely, 2^21001203319 is an apocalyptic number.

21001203319 is a deficient number, since it is larger than the sum of its proper divisors (348377).

21001203319 is an equidigital number, since it uses as much as digits as its factorization.

21001203319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348376.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21001203319 in words is "twenty-one billion, one million, two hundred three thousand, three hundred nineteen".