21547297485 has 192 divisors, whose sum is σ = 46024554240. Its totient is φ = 9532131840.

The previous prime is 21547297459. The next prime is 21547297487. The reversal of 21547297485 is 58479274512.

21547297485 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 72 + 97 + 485 = 666.

It is not a de Polignac number, because 21547297485 - 2¹⁰ = 21547296461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21547297487) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 27035107 + ... + 27035903.

It is an arithmetic number, because the mean of its divisors is an integer number (239711220).

Almost surely, 2^21547297485 is an apocalyptic number.

It is an amenable number.

21547297485 is an abundant number, since it is smaller than the sum of its proper divisors (24477256755).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21547297485 is a wasteful number, since it uses less digits than its factorization.

21547297485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 940 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 21547297485 in words is "twenty-one billion, five hundred forty-seven million, two hundred ninety-seven thousand, four hundred eighty-five".