21454051147 has 2 divisors, whose sum is σ = 21454051148. Its totient is φ = 21454051146.

The previous prime is 21454051141. The next prime is 21454051193. The reversal of 21454051147 is 74115045412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21454051147 - 2³ = 21454051139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21454051141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727025573 + 10727025574.

It is an arithmetic number, because the mean of its divisors is an integer number (10727025574).

Almost surely, 2^21454051147 is an apocalyptic number.

21454051147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21454051147 is an equidigital number, since it uses as much as digits as its factorization.

21454051147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 34.

Adding to 21454051147 its reverse (74115045412), we get a palindrome (95569096559).

The spelling of 21454051147 in words is "twenty-one billion, four hundred fifty-four million, fifty-one thousand, one hundred forty-seven".