21102213023 has 4 divisors (see below), whose sum is σ = 21131977080. Its totient is φ = 21072448968.

The previous prime is 21102213017. The next prime is 21102213031. The reversal of 21102213023 is 32031220112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21102213023 - 2⁴ = 21102213007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102212992 and 21102213010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102213053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14880965 + ... + 14882382.

It is an arithmetic number, because the mean of its divisors is an integer number (5282994270).

Almost surely, 2^21102213023 is an apocalyptic number.

21102213023 is a deficient number, since it is larger than the sum of its proper divisors (29764057).

21102213023 is an equidigital number, since it uses as much as digits as its factorization.

21102213023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29764056.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21102213023 its reverse (32031220112), we get a palindrome (53133433135).

The spelling of 21102213023 in words is "twenty-one billion, one hundred two million, two hundred thirteen thousand, twenty-three".