21020030303223 has 16 divisors (see below), whose sum is σ = 32046513705216. Its totient is φ = 12005449135680.

The previous prime is 21020030303203. The next prime is 21020030303267. The reversal of 21020030303223 is 32230303002012.

It is not a de Polignac number, because 21020030303223 - 2¹² = 21020030299127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21020030303223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020030303203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249821598 + ... + 249905723.

It is an arithmetic number, because the mean of its divisors is an integer number (2002907106576).

Almost surely, 2^{21020030303223} is an apocalyptic number.

21020030303223 is a deficient number, since it is larger than the sum of its proper divisors (11026483401993).

21020030303223 is a wasteful number, since it uses less digits than its factorization.

21020030303223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499729334.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21020030303223 its reverse (32230303002012), we get a palindrome (53250333305235).

The spelling of 21020030303223 in words is "twenty-one trillion, twenty billion, thirty million, three hundred three thousand, two hundred twenty-three".