21201310023 has 16 divisors (see below), whose sum is σ = 29261045760. Its totient is φ = 13643906976.

The previous prime is 21201310007. The next prime is 21201310033. The reversal of 21201310023 is 32001310212.

It is not a de Polignac number, because 21201310023 - 2⁴ = 21201310007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201309984 and 21201310011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201310033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 737883 + ... + 766076.

It is an arithmetic number, because the mean of its divisors is an integer number (1828815360).

Almost surely, 2^21201310023 is an apocalyptic number.

21201310023 is a deficient number, since it is larger than the sum of its proper divisors (8059735737).

21201310023 is a wasteful number, since it uses less digits than its factorization.

21201310023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504126.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21201310023 its reverse (32001310212), we get a palindrome (53202620235).

The spelling of 21201310023 in words is "twenty-one billion, two hundred one million, three hundred ten thousand, twenty-three".