21450000023 has 2 divisors, whose sum is σ = 21450000024. Its totient is φ = 21450000022.

The previous prime is 21450000001. The next prime is 21450000029. The reversal of 21450000023 is 32000005412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21450000023 - 2²⁴ = 21433222807 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21449999956 and 21450000010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450000029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725000011 + 10725000012.

It is an arithmetic number, because the mean of its divisors is an integer number (10725000012).

Almost surely, 2^21450000023 is an apocalyptic number.

21450000023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450000023 is an equidigital number, since it uses as much as digits as its factorization.

21450000023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 21450000023 its reverse (32000005412), we get a palindrome (53450005435).

The spelling of 21450000023 in words is "twenty-one billion, four hundred fifty million, twenty-three", and thus it is an aban number.