21945061362 has 64 divisors (see below), whose sum is σ = 50724624384. Its totient is φ = 6199580160.

The previous prime is 21945061357. The next prime is 21945061399. The reversal of 21945061362 is 26316054912.

It is a self number, because there is not a number n which added to its sum of digits gives 21945061362.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6284437 + ... + 6287927.

It is an arithmetic number, because the mean of its divisors is an integer number (792572256).

Almost surely, 2^21945061362 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21945061362, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25362312192).

21945061362 is an abundant number, since it is smaller than the sum of its proper divisors (28779563022).

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

21945061362 is a wasteful number, since it uses less digits than its factorization.

21945061362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 21945061362 in words is "twenty-one billion, nine hundred forty-five million, sixty-one thousand, three hundred sixty-two".