21021111220001 has 8 divisors (see below), whose sum is σ = 21095700317280. Its totient is φ = 20946524303232.

The previous prime is 21021111219869. The next prime is 21021111220007. The reversal of 21021111220001 is 10002211112012.

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 21021111220001 - 2¹⁸ = 21021110957857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021111220007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20162705 + ... + 21179633.

It is an arithmetic number, because the mean of its divisors is an integer number (2636962539660).

Almost surely, 2^{21021111220001} is an apocalyptic number.

It is an amenable number.

21021111220001 is a deficient number, since it is larger than the sum of its proper divisors (74589097279).

21021111220001 is a wasteful number, since it uses less digits than its factorization.

21021111220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090255.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021111220001 its reverse (10002211112012), we get a palindrome (31023322332013).

The spelling of 21021111220001 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred twenty thousand, one".