210221211010021 has 4 divisors (see below), whose sum is σ = 210226631496192. Its totient is φ = 210215790523852.

The previous prime is 210221211009973. The next prime is 210221211010037. The reversal of 210221211010021 is 120010112122012.

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 210221211010021 - 2⁴³ = 201425117987813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221211009977 and 210221211010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221211010721) 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, 2710184911 + ... + 2710262476.

It is an arithmetic number, because the mean of its divisors is an integer number (52556657874048).

Almost surely, 2^{210221211010021} is an apocalyptic number.

It is an amenable number.

210221211010021 is a deficient number, since it is larger than the sum of its proper divisors (5420486171).

210221211010021 is an equidigital number, since it uses as much as digits as its factorization.

210221211010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420486170.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210221211010021 its reverse (120010112122012), we get a palindrome (330231323132033).

The spelling of 210221211010021 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred eleven million, ten thousand, twenty-one".