21212320221001 has 8 divisors (see below), whose sum is σ = 26107471041344. Its totient is φ = 16783374240720.

The previous prime is 21212320220921. The next prime is 21212320221013. The reversal of 21212320221001 is 10012202321212.

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 21212320221001 - 2¹¹ = 21212320218953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212320221001.

It is not an unprimeable number, because it can be changed into a prime (21212320221031) 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, 116551209915 + ... + 116551210096.

It is an arithmetic number, because the mean of its divisors is an integer number (3263433880168).

Almost surely, 2^{21212320221001} is an apocalyptic number.

It is an amenable number.

21212320221001 is a deficient number, since it is larger than the sum of its proper divisors (4895150820343).

21212320221001 is a wasteful number, since it uses less digits than its factorization.

21212320221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233102420031.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21212320221001 its reverse (10012202321212), we get a palindrome (31224522542213).

The spelling of 21212320221001 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty million, two hundred twenty-one thousand, one".