21153216462036 has 192 divisors, whose sum is σ = 55942716211200. Its totient is φ = 6187981547520.

The previous prime is 21153216462031. The next prime is 21153216462127. The reversal of 21153216462036 is 63026461235112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153216462031) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23661915 + ... + 24539613.

It is an arithmetic number, because the mean of its divisors is an integer number (291368313600).

Almost surely, 2^{21153216462036} 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 21153216462036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27971358105600).

21153216462036 is an abundant number, since it is smaller than the sum of its proper divisors (34789499749164).

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

21153216462036 is a wasteful number, since it uses less digits than its factorization.

21153216462036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877894 (or 877892 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 21153216462036 its reverse (63026461235112), we get a palindrome (84179677697148).

The spelling of 21153216462036 in words is "twenty-one trillion, one hundred fifty-three billion, two hundred sixteen million, four hundred sixty-two thousand, thirty-six".