21015081449712 has 240 divisors, whose sum is σ = 68245826987520. Its totient is φ = 5912425612800.

The previous prime is 21015081449711. The next prime is 21015081449717. The reversal of 21015081449712 is 21794418051012.

It is a happy number.

21015081449712 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 508 + 1 + 44 + 97 + 12 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21015081449711) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57860614 + ... + 58222682.

It is an arithmetic number, because the mean of its divisors is an integer number (284357612448).

Almost surely, 2^{21015081449712} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21015081449712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34122913493760).

21015081449712 is an abundant number, since it is smaller than the sum of its proper divisors (47230745537808).

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

21015081449712 is a wasteful number, since it uses less digits than its factorization.

21015081449712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362972 (or 362963 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 21015081449712 in words is "twenty-one trillion, fifteen billion, eighty-one million, four hundred forty-nine thousand, seven hundred twelve".