21350041056 has 144 divisors (see below), whose sum is σ = 64911266784. Its totient is φ = 6632865792.

The previous prime is 21350041033. The next prime is 21350041067. The reversal of 21350041056 is 65014005312.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483120 + ... + 525456.

It is an arithmetic number, because the mean of its divisors is an integer number (450772686).

Almost surely, 2^21350041056 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 21350041056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32455633392).

21350041056 is an abundant number, since it is smaller than the sum of its proper divisors (43561225728).

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

21350041056 is a wasteful number, since it uses less digits than its factorization.

21350041056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42473 (or 42462 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21350041056 its reverse (65014005312), we get a palindrome (86364046368).

The spelling of 21350041056 in words is "twenty-one billion, three hundred fifty million, forty-one thousand, fifty-six".