21210220100001 has 8 divisors (see below), whose sum is σ = 28290929164960. Its totient is φ = 14134828884192.

The previous prime is 21210220099963. The next prime is 21210220100009. The reversal of 21210220100001 is 10000102201212.

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

It is not a de Polignac number, because 21210220100001 - 2¹⁸ = 21210219837857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210220100001.

It is not an unprimeable number, because it can be changed into a prime (21210220100009) 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, 1329452980 + ... + 1329468933.

It is an arithmetic number, because the mean of its divisors is an integer number (3536366145620).

Almost surely, 2^{21210220100001} is an apocalyptic number.

It is an amenable number.

21210220100001 is a deficient number, since it is larger than the sum of its proper divisors (7080709064959).

21210220100001 is a wasteful number, since it uses less digits than its factorization.

21210220100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658924575.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210220100001 its reverse (10000102201212), we get a palindrome (31210322301213).

The spelling of 21210220100001 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred thousand, one".