21000000210036 has 12 divisors (see below), whose sum is σ = 49000000490112. Its totient is φ = 7000000070008.

The previous prime is 21000000210011. The next prime is 21000000210037. The reversal of 21000000210036 is 63001200000012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21000000209997 and 21000000210024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000000210037) 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, 875000008740 + ... + 875000008763.

It is an arithmetic number, because the mean of its divisors is an integer number (4083333374176).

Almost surely, 2^{21000000210036} is an apocalyptic number.

It is an amenable number.

21000000210036 is an abundant number, since it is smaller than the sum of its proper divisors (28000000280076).

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

21000000210036 is a wasteful number, since it uses less digits than its factorization.

21000000210036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750000017510 (or 1750000017508 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21000000210036 its reverse (63001200000012), we get a palindrome (84001200210048).

The spelling of 21000000210036 in words is "twenty-one trillion, two hundred ten thousand, thirty-six".