21035105142536 has 32 divisors (see below), whose sum is σ = 39464001532800. Its totient is φ = 10511372097600.

The previous prime is 21035105142529. The next prime is 21035105142577. The reversal of 21035105142536 is 63524150153012.

It is a super-2 number, since 2×21035105142536² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21035105142536.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331548305 + ... + 331611743.

It is an arithmetic number, because the mean of its divisors is an integer number (1233250047900).

Almost surely, 2^{21035105142536} is an apocalyptic number.

It is an amenable number.

21035105142536 is a deficient number, since it is larger than the sum of its proper divisors (18428896390264).

21035105142536 is a wasteful number, since it uses less digits than its factorization.

21035105142536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87149 (or 87145 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 21035105142536 its reverse (63524150153012), we get a palindrome (84559255295548).

The spelling of 21035105142536 in words is "twenty-one trillion, thirty-five billion, one hundred five million, one hundred forty-two thousand, five hundred thirty-six".