21213320023 has 32 divisors (see below), whose sum is σ = 24872209920. Its totient is φ = 17717821440.

The previous prime is 21213320021. The next prime is 21213320077. The reversal of 21213320023 is 32002331212.

It is a cyclic number.

It is not a de Polignac number, because 21213320023 - 2¹ = 21213320021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213320021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33093783 + ... + 33094423.

It is an arithmetic number, because the mean of its divisors is an integer number (777256560).

Almost surely, 2^21213320023 is an apocalyptic number.

21213320023 is a deficient number, since it is larger than the sum of its proper divisors (3658889897).

21213320023 is a wasteful number, since it uses less digits than its factorization.

21213320023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21213320023 its reverse (32002331212), we get a palindrome (53215651235).

The spelling of 21213320023 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, twenty-three".