121210211122221 has 32 divisors (see below), whose sum is σ = 181742441932800. Its totient is φ = 71296816688064.

The previous prime is 121210211122219. The next prime is 121210211122339. The reversal of 121210211122221 is 122221112012121.

It is not a de Polignac number, because 121210211122221 - 2¹ = 121210211122219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210211120221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47039751 + ... + 49549556.

It is an arithmetic number, because the mean of its divisors is an integer number (5679451310400).

Almost surely, 2^{121210211122221} is an apocalyptic number.

It is an amenable number.

121210211122221 is a deficient number, since it is larger than the sum of its proper divisors (60532230810579).

121210211122221 is a wasteful number, since it uses less digits than its factorization.

121210211122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96590745.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121210211122221 its reverse (122221112012121), we get a palindrome (243431323134342).

The spelling of 121210211122221 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".