21035331126784 has 160 divisors (see below), whose sum is σ = 48121723387584. Its totient is φ = 9111280189440.

The previous prime is 21035331126767. The next prime is 21035331126851. The reversal of 21035331126784 is 48762113353012.

It is a super-2 number, since 2×21035331126784² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6817374 + ... + 9409954.

Almost surely, 2^{21035331126784} 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 21035331126784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24060861693792).

21035331126784 is an abundant number, since it is smaller than the sum of its proper divisors (27086392260800).

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

21035331126784 is a wasteful number, since it uses less digits than its factorization.

21035331126784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592688 (or 2592672 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

Adding to 21035331126784 its reverse (48762113353012), we get a palindrome (69797444479796).

The spelling of 21035331126784 in words is "twenty-one trillion, thirty-five billion, three hundred thirty-one million, one hundred twenty-six thousand, seven hundred eighty-four".