21123232023 has 8 divisors (see below), whose sum is σ = 28165942000. Its totient is φ = 14081338368.

The previous prime is 21123231953. The next prime is 21123232049. The reversal of 21123232023 is 32023232112.

It is a happy number.

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

It is not a de Polignac number, because 21123232023 - 2⁹ = 21123231511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123232093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140908 + ... + 249201.

It is an arithmetic number, because the mean of its divisors is an integer number (3520742750).

Almost surely, 2^21123232023 is an apocalyptic number.

21123232023 is a deficient number, since it is larger than the sum of its proper divisors (7042709977).

21123232023 is a wasteful number, since it uses less digits than its factorization.

21123232023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408161.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21123232023 its reverse (32023232112), we get a palindrome (53146464135).

The spelling of 21123232023 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, twenty-three".