21026596734 has 640 divisors, whose sum is σ = 63696568320. Its totient is φ = 5080838400.

The previous prime is 21026596733. The next prime is 21026596739. The reversal of 21026596734 is 43769562012.

21026596734 is a `hidden beast` number, since 2 + 1 + 0 + 26 + 596 + 7 + 34 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21026596734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026596733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 313829769 + ... + 313829835.

It is an arithmetic number, because the mean of its divisors is an integer number (99525888).

Almost surely, 2^21026596734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21026596734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31848284160).

21026596734 is an abundant number, since it is smaller than the sum of its proper divisors (42669971586).

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

21026596734 is a wasteful number, since it uses less digits than its factorization.

21026596734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21026596734 in words is "twenty-one billion, twenty-six million, five hundred ninety-six thousand, seven hundred thirty-four".