121211110020221 has 16 divisors (see below), whose sum is σ = 131756287191984. Its totient is φ = 110844625941504.

The previous prime is 121211110020191. The next prime is 121211110020223. The reversal of 121211110020221 is 122020011112121.

It can be written as a sum of positive squares in 8 ways, for example, as 2043430224196 + 119167679796025 = 1429486^2 + 10916395^2 .

It is not a de Polignac number, because 121211110020221 - 2⁴² = 116813063509117 is a prime.

It is a super-2 number, since 2×121211110020221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121211110020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211110020223) 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, 87425090 + ... + 88800723.

It is an arithmetic number, because the mean of its divisors is an integer number (8234767949499).

Almost surely, 2^{121211110020221} is an apocalyptic number.

It is an amenable number.

121211110020221 is a deficient number, since it is larger than the sum of its proper divisors (10545177171763).

121211110020221 is a wasteful number, since it uses less digits than its factorization.

121211110020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176226320.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121211110020221 its reverse (122020011112121), we get a palindrome (243231121132342).

The spelling of 121211110020221 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred ten million, twenty thousand, two hundred twenty-one".