21512244421201 has 8 divisors (see below), whose sum is σ = 21557369998080. Its totient is φ = 21467119740432.

The previous prime is 21512244421189. The next prime is 21512244421207. The reversal of 21512244421201 is 10212444221512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21512244421201 - 2²¹ = 21512242324049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21512244421207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72604111 + ... + 72899803.

It is an arithmetic number, because the mean of its divisors is an integer number (2694671249760).

Almost surely, 2^{21512244421201} is an apocalyptic number.

It is an amenable number.

21512244421201 is a deficient number, since it is larger than the sum of its proper divisors (45125576879).

21512244421201 is a wasteful number, since it uses less digits than its factorization.

21512244421201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448055.

The product of its (nonzero) digits is 10240, while the sum is 31.

Adding to 21512244421201 its reverse (10212444221512), we get a palindrome (31724688642713).

The spelling of 21512244421201 in words is "twenty-one trillion, five hundred twelve billion, two hundred forty-four million, four hundred twenty-one thousand, two hundred one".