21036452220036 has 144 divisors (see below), whose sum is σ = 59251791755520. Its totient is φ = 6238215413760.

The previous prime is 21036452219983. The next prime is 21036452220103. The reversal of 21036452220036 is 63002225463012.

21036452220036 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 645 + 2 + 2 + 2 + 0 + 0 + 3 + 6 = 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 47 ways as a sum of consecutive naturals, for example, 146534980 + ... + 146678468.

It is an arithmetic number, because the mean of its divisors is an integer number (411470776080).

Almost surely, 2^{21036452220036} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21036452220036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29625895877760).

21036452220036 is an abundant number, since it is smaller than the sum of its proper divisors (38215339535484).

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

21036452220036 is a wasteful number, since it uses less digits than its factorization.

21036452220036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151434 (or 151429 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 21036452220036 its reverse (63002225463012), we get a palindrome (84038677683048).

The spelling of 21036452220036 in words is "twenty-one trillion, thirty-six billion, four hundred fifty-two million, two hundred twenty thousand, thirty-six".