21454657147 has 16 divisors (see below), whose sum is σ = 26799858432. Its totient is φ = 16685917920.

The previous prime is 21454657097. The next prime is 21454657207. The reversal of 21454657147 is 74175645412.

It is not a de Polignac number, because 21454657147 - 2²³ = 21446268539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21454657097 and 21454657106.

It is not an unprimeable number, because it can be changed into a prime (21454657247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226108 + ... + 306649.

It is an arithmetic number, because the mean of its divisors is an integer number (1674991152).

Almost surely, 2^21454657147 is an apocalyptic number.

21454657147 is a deficient number, since it is larger than the sum of its proper divisors (5345201285).

21454657147 is a wasteful number, since it uses less digits than its factorization.

21454657147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533298.

The product of its digits is 940800, while the sum is 46.

The spelling of 21454657147 in words is "twenty-one billion, four hundred fifty-four million, six hundred fifty-seven thousand, one hundred forty-seven".