21450124310551 has 2 divisors, whose sum is σ = 21450124310552. Its totient is φ = 21450124310550.

The previous prime is 21450124310533. The next prime is 21450124310599. The reversal of 21450124310551 is 15501342105412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21450124310551 - 2⁵ = 21450124310519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450124910551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725062155275 + 10725062155276.

It is an arithmetic number, because the mean of its divisors is an integer number (10725062155276).

Almost surely, 2^{21450124310551} is an apocalyptic number.

21450124310551 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450124310551 is an equidigital number, since it uses as much as digits as its factorization.

21450124310551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 21450124310551 its reverse (15501342105412), we get a palindrome (36951466415963).

The spelling of 21450124310551 in words is "twenty-one trillion, four hundred fifty billion, one hundred twenty-four million, three hundred ten thousand, five hundred fifty-one".