21320021203 has 8 divisors (see below), whose sum is σ = 23393231568. Its totient is φ = 19308697824.

The previous prime is 21320021179. The next prime is 21320021207. The reversal of 21320021203 is 30212002312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21320021203 - 2²¹ = 21317924051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320021207) 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, 15471025 + ... + 15472402.

It is an arithmetic number, because the mean of its divisors is an integer number (2924153946).

Almost surely, 2^21320021203 is an apocalyptic number.

21320021203 is a deficient number, since it is larger than the sum of its proper divisors (2073210365).

21320021203 is a wasteful number, since it uses less digits than its factorization.

21320021203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30943493.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21320021203 its reverse (30212002312), we get a palindrome (51532023515).

The spelling of 21320021203 in words is "twenty-one billion, three hundred twenty million, twenty-one thousand, two hundred three".