21000104240536 has 16 divisors (see below), whose sum is σ = 39386752647840. Its totient is φ = 10496970201120.

The previous prime is 21000104240509. The next prime is 21000104240539. The reversal of 21000104240536 is 63504240100012.

It is a super-2 number, since 2×21000104240536² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000104240539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385210935 + ... + 385265446.

It is an arithmetic number, because the mean of its divisors is an integer number (2461672040490).

Almost surely, 2^{21000104240536} is an apocalyptic number.

It is an amenable number.

21000104240536 is a deficient number, since it is larger than the sum of its proper divisors (18386648407304).

21000104240536 is a wasteful number, since it uses less digits than its factorization.

21000104240536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770479794 (or 770479790 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21000104240536 its reverse (63504240100012), we get a palindrome (84504344340548).

The spelling of 21000104240536 in words is "twenty-one trillion, one hundred four million, two hundred forty thousand, five hundred thirty-six".