21210021022001 has 4 divisors (see below), whose sum is σ = 24240024025152. Its totient is φ = 18180018018852.

The previous prime is 21210021021997. The next prime is 21210021022013. The reversal of 21210021022001 is 10022012001212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210021022001 - 2² = 21210021021997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210021022051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515001501565 + ... + 1515001501578.

It is an arithmetic number, because the mean of its divisors is an integer number (6060006006288).

Almost surely, 2^{21210021022001} is an apocalyptic number.

It is an amenable number.

21210021022001 is a deficient number, since it is larger than the sum of its proper divisors (3030003003151).

21210021022001 is an equidigital number, since it uses as much as digits as its factorization.

21210021022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030003003150.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210021022001 its reverse (10022012001212), we get a palindrome (31232033023213).

The spelling of 21210021022001 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, twenty-two thousand, one".