121010210221 has 4 divisors (see below), whose sum is σ = 121020465852. Its totient is φ = 120999954592.

The previous prime is 121010210207. The next prime is 121010210261. The reversal of 121010210221 is 122012010121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73446962121 + 47563248100 = 271011^2 + 218090^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010210221 - 2¹⁷ = 121010079149 is a prime.

It is a super-2 number, since 2×121010210221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010210261) 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, 5110096 + ... + 5133721.

It is an arithmetic number, because the mean of its divisors is an integer number (30255116463).

Almost surely, 2^121010210221 is an apocalyptic number.

It is an amenable number.

121010210221 is a deficient number, since it is larger than the sum of its proper divisors (10255631).

121010210221 is a wasteful number, since it uses less digits than its factorization.

121010210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255630.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121010210221 its reverse (122012010121), we get a palindrome (243022220342).

The spelling of 121010210221 in words is "one hundred twenty-one billion, ten million, two hundred ten thousand, two hundred twenty-one".