21124231023 has 8 divisors (see below), whose sum is σ = 32189304448. Its totient is φ = 12070989144.

The previous prime is 21124231019. The next prime is 21124231039. The reversal of 21124231023 is 32013242112.

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

It is not a de Polignac number, because 21124231023 - 2² = 21124231019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1005915763 = 21124231023 / (2 + 1 + 1 + 2 + 4 + 2 + 3 + 1 + 0 + 2 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124231043) 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, 502957861 + ... + 502957902.

It is an arithmetic number, because the mean of its divisors is an integer number (4023663056).

Almost surely, 2^21124231023 is an apocalyptic number.

21124231023 is a deficient number, since it is larger than the sum of its proper divisors (11065073425).

21124231023 is a wasteful number, since it uses less digits than its factorization.

21124231023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005915773.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21124231023 its reverse (32013242112), we get a palindrome (53137473135).

The spelling of 21124231023 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-one thousand, twenty-three".