21020020013223 has 48 divisors (see below), whose sum is σ = 39118984334080. Its totient is φ = 10919490904080.

The previous prime is 21020020013147. The next prime is 21020020013233. The reversal of 21020020013223 is 32231002002012.

21020020013223 is a `hidden beast` number, since 210 + 20 + 0 + 200 + 13 + 223 = 666.

It is not a de Polignac number, because 21020020013223 - 2¹² = 21020020009127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020020013196 and 21020020013205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020020013233) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 459551665 + ... + 459597402.

Almost surely, 2^{21020020013223} is an apocalyptic number.

21020020013223 is a deficient number, since it is larger than the sum of its proper divisors (18098964320857).

21020020013223 is a wasteful number, since it uses less digits than its factorization.

21020020013223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919149105 (or 919149088 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21020020013223 its reverse (32231002002012), we get a palindrome (53251022015235).

The spelling of 21020020013223 in words is "twenty-one trillion, twenty billion, twenty million, thirteen thousand, two hundred twenty-three".