21010351236 has 96 divisors (see below), whose sum is σ = 58891069440. Its totient is φ = 5699975424.

The previous prime is 21010351211. The next prime is 21010351237. The reversal of 21010351236 is 63215301012.

It is not an unprimeable number, because it can be changed into a prime (21010351237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224995 + ... + 304373.

It is an arithmetic number, because the mean of its divisors is an integer number (613448640).

Almost surely, 2^21010351236 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 21010351236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29445534720).

21010351236 is an abundant number, since it is smaller than the sum of its proper divisors (37880718204).

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

21010351236 is a wasteful number, since it uses less digits than its factorization.

21010351236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79553 (or 79551 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21010351236 its reverse (63215301012), we get a palindrome (84225652248).

The spelling of 21010351236 in words is "twenty-one billion, ten million, three hundred fifty-one thousand, two hundred thirty-six".