21631336350 has 192 divisors, whose sum is σ = 63282824640. Its totient is φ = 4838400000.

The previous prime is 21631336327. The next prime is 21631336351. The reversal of 21631336350 is 5363313612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631336351) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 950100 + ... + 972600.

It is an arithmetic number, because the mean of its divisors is an integer number (329598045).

Almost surely, 2^21631336350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21631336350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31641412320).

21631336350 is an abundant number, since it is smaller than the sum of its proper divisors (41651488290).

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

21631336350 is a wasteful number, since it uses less digits than its factorization.

21631336350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22575 (or 22570 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 33.

Adding to 21631336350 its reverse (5363313612), we get a palindrome (26994649962).

The spelling of 21631336350 in words is "twenty-one billion, six hundred thirty-one million, three hundred thirty-six thousand, three hundred fifty".