21543035540004 has 72 divisors (see below), whose sum is σ = 59413660094880. Its totient is φ = 6527411539200.

The previous prime is 21543035539999. The next prime is 21543035540017. The reversal of 21543035540004 is 40004553034512.

21543035540004 is a `hidden beast` number, since 2 + 1 + 54 + 30 + 35 + 540 + 0 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63939 + ... + 6564309.

It is an arithmetic number, because the mean of its divisors is an integer number (825189723540).

Almost surely, 2^{21543035540004} is an apocalyptic number.

It is an amenable number.

21543035540004 is an abundant number, since it is smaller than the sum of its proper divisors (37870624554876).

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

21543035540004 is a wasteful number, since it uses less digits than its factorization.

21543035540004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6508761 (or 6508756 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 21543035540004 its reverse (40004553034512), we get a palindrome (61547588574516).

The spelling of 21543035540004 in words is "twenty-one trillion, five hundred forty-three billion, thirty-five million, five hundred forty thousand, four".