21369461787006 has 32 divisors (see below), whose sum is σ = 42819192122496. Its totient is φ = 7109776620000.

The previous prime is 21369461786993. The next prime is 21369461787007. The reversal of 21369461787006 is 60078716496312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369461787007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140836281 + ... + 140987931.

It is an arithmetic number, because the mean of its divisors is an integer number (1338099753828).

Almost surely, 2^{21369461787006} is an apocalyptic number.

21369461787006 is an abundant number, since it is smaller than the sum of its proper divisors (21449730335490).

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

21369461787006 is a wasteful number, since it uses less digits than its factorization.

21369461787006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195608.

The product of its (nonzero) digits is 18289152, while the sum is 60.

The spelling of 21369461787006 in words is "twenty-one trillion, three hundred sixty-nine billion, four hundred sixty-one million, seven hundred eighty-seven thousand, six".