121212020020221 has 64 divisors (see below), whose sum is σ = 194853073981440. Its totient is φ = 74027826452160.

The previous prime is 121212020020199. The next prime is 121212020020229. The reversal of 121212020020221 is 122020020212121.

It is a happy number.

121212020020221 is a `hidden beast` number, since 1 + 212 + 12 + 0 + 200 + 20 + 221 = 666.

It is not a de Polignac number, because 121212020020221 - 2¹⁵ = 121212019987453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121212020020194 and 121212020020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212020020229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35348766 + ... + 38625888.

It is an arithmetic number, because the mean of its divisors is an integer number (3044579280960).

Almost surely, 2^{121212020020221} is an apocalyptic number.

It is an amenable number.

121212020020221 is a deficient number, since it is larger than the sum of its proper divisors (73641053961219).

121212020020221 is a wasteful number, since it uses less digits than its factorization.

121212020020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3277943 (or 3277937 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121212020020221 its reverse (122020020212121), we get a palindrome (243232040232342).

The spelling of 121212020020221 in words is "one hundred twenty-one trillion, two hundred twelve billion, twenty million, twenty thousand, two hundred twenty-one".