21031213320023 has 16 divisors (see below), whose sum is σ = 21783619183104. Its totient is φ = 20295421866720.

The previous prime is 21031213320017. The next prime is 21031213320079. The reversal of 21031213320023 is 32002331213012.

It is a cyclic number.

It is not a de Polignac number, because 21031213320023 - 2¹² = 21031213315927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031213370023) 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, 13333115 + ... + 14826812.

It is an arithmetic number, because the mean of its divisors is an integer number (1361476198944).

Almost surely, 2^{21031213320023} is an apocalyptic number.

21031213320023 is a deficient number, since it is larger than the sum of its proper divisors (752405863081).

21031213320023 is a wasteful number, since it uses less digits than its factorization.

21031213320023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28160222.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21031213320023 its reverse (32002331213012), we get a palindrome (53033544533035).

The spelling of 21031213320023 in words is "twenty-one trillion, thirty-one billion, two hundred thirteen million, three hundred twenty thousand, twenty-three".