210121202221 has 8 divisors (see below), whose sum is σ = 240189399104. Its totient is φ = 180065725920.

The previous prime is 210121202183. The next prime is 210121202227. The reversal of 210121202221 is 122202121012.

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 a de Polignac number, because none of the positive numbers 2^k-210121202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121202195 and 210121202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121202227) 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, 3144720 + ... + 3210841.

It is an arithmetic number, because the mean of its divisors is an integer number (30023674888).

Almost surely, 2^210121202221 is an apocalyptic number.

It is an amenable number.

210121202221 is a deficient number, since it is larger than the sum of its proper divisors (30068196883).

210121202221 is an equidigital number, since it uses as much as digits as its factorization.

210121202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6360291.

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

Adding to 210121202221 its reverse (122202121012), we get a palindrome (332323323233).

The spelling of 210121202221 in words is "two hundred ten billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".