21486091474545 has 32 divisors (see below), whose sum is σ = 34615041897600. Its totient is φ = 11380179486720.

The previous prime is 21486091474543. The next prime is 21486091474553. The reversal of 21486091474545 is 54547419068412.

It is not a de Polignac number, because 21486091474545 - 2¹ = 21486091474543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21486091474543) 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, 10892842 + ... + 12713228.

It is an arithmetic number, because the mean of its divisors is an integer number (1081720059300).

Almost surely, 2^{21486091474545} is an apocalyptic number.

It is an amenable number.

21486091474545 is a deficient number, since it is larger than the sum of its proper divisors (13128950423055).

21486091474545 is a wasteful number, since it uses less digits than its factorization.

21486091474545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825825.

The product of its (nonzero) digits is 38707200, while the sum is 60.

The spelling of 21486091474545 in words is "twenty-one trillion, four hundred eighty-six billion, ninety-one million, four hundred seventy-four thousand, five hundred forty-five".