21123451335023 has 8 divisors (see below), whose sum is σ = 21419626675200. Its totient is φ = 20827995742008.

The previous prime is 21123451335013. The next prime is 21123451335059. The reversal of 21123451335023 is 32053315432112.

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 21123451335023 - 2⁸ = 21123451334767 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 (21123451335013) 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, 179877683 + ... + 179995076.

It is an arithmetic number, because the mean of its divisors is an integer number (2677453334400).

Almost surely, 2^{21123451335023} is an apocalyptic number.

21123451335023 is a deficient number, since it is larger than the sum of its proper divisors (296175340177).

21123451335023 is an equidigital number, since it uses as much as digits as its factorization.

21123451335023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359873581.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 21123451335023 its reverse (32053315432112), we get a palindrome (53176766767135).

The spelling of 21123451335023 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred fifty-one million, three hundred thirty-five thousand, twenty-three".