21238064781486 has 32 divisors (see below), whose sum is σ = 48547106592000. Its totient is φ = 6067648694016.

The previous prime is 21238064781481. The next prime is 21238064781497. The reversal of 21238064781486 is 68418746083212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21238064781481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14711236 + ... + 16090263.

It is an arithmetic number, because the mean of its divisors is an integer number (1517097081000).

Almost surely, 2^{21238064781486} is an apocalyptic number.

21238064781486 is an abundant number, since it is smaller than the sum of its proper divisors (27309041810514).

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

21238064781486 is a wasteful number, since it uses less digits than its factorization.

21238064781486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30817928.

The product of its (nonzero) digits is 24772608, while the sum is 60.

The spelling of 21238064781486 in words is "twenty-one trillion, two hundred thirty-eight billion, sixty-four million, seven hundred eighty-one thousand, four hundred eighty-six".