21214036536252 has 144 divisors (see below), whose sum is σ = 58178791883520. Its totient is φ = 5998386283008.

The previous prime is 21214036536241. The next prime is 21214036536257. The reversal of 21214036536252 is 25263563041212.

It is a super-2 number, since 2×21214036536252² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43544353 + ... + 44028839.

It is an arithmetic number, because the mean of its divisors is an integer number (404019388080).

Almost surely, 2^{21214036536252} 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 21214036536252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29089395941760).

21214036536252 is an abundant number, since it is smaller than the sum of its proper divisors (36964755347268).

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

21214036536252 is a wasteful number, since it uses less digits than its factorization.

21214036536252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485280 (or 485271 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 21214036536252 its reverse (25263563041212), we get a palindrome (46477599577464).

The spelling of 21214036536252 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, two hundred fifty-two".