21454543473 has 32 divisors (see below), whose sum is σ = 33074697600. Its totient is φ = 12225884160.

The previous prime is 21454543469. The next prime is 21454543477. The reversal of 21454543473 is 37434545412.

It is an interprime number because it is at equal distance from previous prime (21454543469) and next prime (21454543477).

It is not a de Polignac number, because 21454543473 - 2² = 21454543469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21454543477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 570261 + ... + 606717.

It is an arithmetic number, because the mean of its divisors is an integer number (1033584300).

Almost surely, 2^21454543473 is an apocalyptic number.

It is an amenable number.

21454543473 is a deficient number, since it is larger than the sum of its proper divisors (11620154127).

21454543473 is a wasteful number, since it uses less digits than its factorization.

21454543473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37537.

The product of its digits is 806400, while the sum is 42.

The spelling of 21454543473 in words is "twenty-one billion, four hundred fifty-four million, five hundred forty-three thousand, four hundred seventy-three".