21450000029 has 2 divisors, whose sum is σ = 21450000030. Its totient is φ = 21450000028.

The previous prime is 21450000023. The next prime is 21450000079. The reversal of 21450000029 is 92000005412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16621139929 + 4828860100 = 128923^2 + 69490^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450000029 - 2²⁰ = 21448951453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21449999959 and 21450000013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450000023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725000014 + 10725000015.

It is an arithmetic number, because the mean of its divisors is an integer number (10725000015).

Almost surely, 2^21450000029 is an apocalyptic number.

It is an amenable number.

21450000029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450000029 is an equidigital number, since it uses as much as digits as its factorization.

21450000029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 21450000029 in words is "twenty-one billion, four hundred fifty million, twenty-nine", and thus it is an aban number.