21450012127 has 2 divisors, whose sum is σ = 21450012128. Its totient is φ = 21450012126.

The previous prime is 21450012079. The next prime is 21450012163. The reversal of 21450012127 is 72121005412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21450012127 - 2²⁷ = 21315794399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450013127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725006063 + 10725006064.

It is an arithmetic number, because the mean of its divisors is an integer number (10725006064).

Almost surely, 2^21450012127 is an apocalyptic number.

21450012127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450012127 is an equidigital number, since it uses as much as digits as its factorization.

21450012127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 21450012127 its reverse (72121005412), we get a palindrome (93571017539).

The spelling of 21450012127 in words is "twenty-one billion, four hundred fifty million, twelve thousand, one hundred twenty-seven".