21210012023 has 8 divisors (see below), whose sum is σ = 21257485536. Its totient is φ = 21162592800.

The previous prime is 21210012013. The next prime is 21210012049. The reversal of 21210012023 is 32021001212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210012023 - 2¹⁸ = 21209749879 is a prime.

It is a super-2 number, since 2×21210012023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210011989 and 21210012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210012013) 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 7 ways as a sum of consecutive naturals, for example, 825590 + ... + 850892.

It is an arithmetic number, because the mean of its divisors is an integer number (2657185692).

Almost surely, 2^21210012023 is an apocalyptic number.

21210012023 is a deficient number, since it is larger than the sum of its proper divisors (47473513).

21210012023 is a wasteful number, since it uses less digits than its factorization.

21210012023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27145.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21210012023 its reverse (32021001212), we get a palindrome (53231013235).

The spelling of 21210012023 in words is "twenty-one billion, two hundred ten million, twelve thousand, twenty-three".