21349259694 has 64 divisors (see below), whose sum is σ = 54384468480. Its totient is φ = 6081324480.

The previous prime is 21349259677. The next prime is 21349259699. The reversal of 21349259694 is 49695294312.

21349259694 is a `hidden beast` number, since 2 + 1 + 3 + 49 + 2 + 596 + 9 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21349259694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349259699) 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 31 ways as a sum of consecutive naturals, for example, 39802 + ... + 210434.

It is an arithmetic number, because the mean of its divisors is an integer number (849757320).

Almost surely, 2^21349259694 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21349259694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27192234240).

21349259694 is an abundant number, since it is smaller than the sum of its proper divisors (33035208786).

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

21349259694 is a wasteful number, since it uses less digits than its factorization.

21349259694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170982 (or 170976 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 21349259694 in words is "twenty-one billion, three hundred forty-nine million, two hundred fifty-nine thousand, six hundred ninety-four".