21210102022021 has 8 divisors (see below), whose sum is σ = 23138935974144. Its totient is φ = 19281375213120.

The previous prime is 21210102022013. The next prime is 21210102022093. The reversal of 21210102022021 is 12022020101212.

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 21210102022021 - 2³ = 21210102022013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210102021986 and 21210102022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210102022001) 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, 26371605 + ... + 27163978.

It is an arithmetic number, because the mean of its divisors is an integer number (2892366996768).

Almost surely, 2^{21210102022021} is an apocalyptic number.

It is an amenable number.

21210102022021 is a deficient number, since it is larger than the sum of its proper divisors (1928833952123).

21210102022021 is a wasteful number, since it uses less digits than its factorization.

21210102022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53571611.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210102022021 its reverse (12022020101212), we get a palindrome (33232122123233).

The spelling of 21210102022021 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, twenty-two thousand, twenty-one".