21234153023 has 2 divisors, whose sum is σ = 21234153024. Its totient is φ = 21234153022.

The previous prime is 21234153007. The next prime is 21234153043. The reversal of 21234153023 is 32035143212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234153023 - 2⁴ = 21234153007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21234152983 and 21234153001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234153043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617076511 + 10617076512.

It is an arithmetic number, because the mean of its divisors is an integer number (10617076512).

Almost surely, 2^21234153023 is an apocalyptic number.

21234153023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234153023 is an equidigital number, since it uses as much as digits as its factorization.

21234153023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21234153023 its reverse (32035143212), we get a palindrome (53269296235).

The spelling of 21234153023 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-three thousand, twenty-three".