36531447021 has 24 divisors (see below), whose sum is σ = 52910324480. Its totient is φ = 24288538176.

The previous prime is 36531446989. The next prime is 36531447031. The reversal of 36531447021 is 12074413563.

36531447021 is a `hidden beast` number, since 36 + 531 + 4 + 4 + 70 + 21 = 666.

It is not a de Polignac number, because 36531447021 - 2⁵ = 36531446989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36531447031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6164766 + ... + 6170688.

Almost surely, 2^36531447021 is an apocalyptic number.

It is an amenable number.

36531447021 is a deficient number, since it is larger than the sum of its proper divisors (16378877459).

36531447021 is a wasteful number, since it uses less digits than its factorization.

36531447021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7665 (or 7662 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 36531447021 in words is "thirty-six billion, five hundred thirty-one million, four hundred forty-seven thousand, twenty-one".