21213420001023 has 32 divisors (see below), whose sum is σ = 28981066752000. Its totient is φ = 13794919377120.

The previous prime is 21213420001019. The next prime is 21213420001061. The reversal of 21213420001023 is 32010002431212.

It is not a de Polignac number, because 21213420001023 - 2² = 21213420001019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213420001523) 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, 294468018 + ... + 294540048.

It is an arithmetic number, because the mean of its divisors is an integer number (905658336000).

Almost surely, 2^{21213420001023} is an apocalyptic number.

21213420001023 is a deficient number, since it is larger than the sum of its proper divisors (7767646750977).

21213420001023 is a wasteful number, since it uses less digits than its factorization.

21213420001023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75099.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21213420001023 its reverse (32010002431212), we get a palindrome (53223422432235).

The spelling of 21213420001023 in words is "twenty-one trillion, two hundred thirteen billion, four hundred twenty million, one thousand, twenty-three".