121210220221 has 16 divisors (see below), whose sum is σ = 123367495680. Its totient is φ = 119074147200.

The previous prime is 121210220213. The next prime is 121210220231. The reversal of 121210220221 is 122022012121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121210220221 - 2³ = 121210220213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210220195 and 121210220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210220231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13240996 + ... + 13250146.

It is an arithmetic number, because the mean of its divisors is an integer number (7710468480).

Almost surely, 2^121210220221 is an apocalyptic number.

It is an amenable number.

121210220221 is a deficient number, since it is larger than the sum of its proper divisors (2157275459).

121210220221 is a wasteful number, since it uses less digits than its factorization.

121210220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284.

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

Adding to 121210220221 its reverse (122022012121), we get a palindrome (243232232342).

The spelling of 121210220221 in words is "one hundred twenty-one billion, two hundred ten million, two hundred twenty thousand, two hundred twenty-one".