21202112023 has 4 divisors (see below), whose sum is σ = 21265026640. Its totient is φ = 21139197408.

The previous prime is 21202111999. The next prime is 21202112051. The reversal of 21202112023 is 32021120212.

It is a happy number.

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 21202112023 - 2⁵ = 21202111991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202111988 and 21202112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202112083) 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, 31456803 + ... + 31457476.

It is an arithmetic number, because the mean of its divisors is an integer number (5316256660).

Almost surely, 2^21202112023 is an apocalyptic number.

21202112023 is a deficient number, since it is larger than the sum of its proper divisors (62914617).

21202112023 is an equidigital number, since it uses as much as digits as its factorization.

21202112023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62914616.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21202112023 its reverse (32021120212), we get a palindrome (53223232235).

It can be divided in two parts, 21202 and 112023, that added together give a square (133225 = 365²).

The spelling of 21202112023 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, twenty-three".