210121101221221 has 4 divisors (see below), whose sum is σ = 210126438753952. Its totient is φ = 210115763688492.

The previous prime is 210121101221177. The next prime is 210121101221237. The reversal of 210121101221221 is 122122101121012.

It is a happy number.

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 210121101221221 - 2⁴³ = 201325008199013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121101261221) 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, 2668707315 + ... + 2668786048.

It is an arithmetic number, because the mean of its divisors is an integer number (52531609688488).

Almost surely, 2^{210121101221221} is an apocalyptic number.

It is an amenable number.

210121101221221 is a deficient number, since it is larger than the sum of its proper divisors (5337532731).

210121101221221 is an equidigital number, since it uses as much as digits as its factorization.

210121101221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337532730.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210121101221221 its reverse (122122101121012), we get a palindrome (332243202342233).

The spelling of 210121101221221 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".