1202021221221 has 24 divisors (see below), whose sum is σ = 1860708145920. Its totient is φ = 745789895136.

The previous prime is 1202021221213. The next prime is 1202021221231. The reversal of 1202021221221 is 1221221202021.

It is a happy number.

1202021221221 is a `hidden beast` number, since 1 + 20 + 202 + 1 + 221 + 221 = 666.

It is not a de Polignac number, because 1202021221221 - 2³ = 1202021221213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1202021221194 and 1202021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202021221231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78463501 + ... + 78478818.

It is an arithmetic number, because the mean of its divisors is an integer number (77529506080).

Almost surely, 2^{1202021221221} is an apocalyptic number.

It is an amenable number.

1202021221221 is a deficient number, since it is larger than the sum of its proper divisors (658686924699).

1202021221221 is a wasteful number, since it uses less digits than its factorization.

1202021221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156942385 (or 156942382 counting only the distinct ones).

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

Adding to 1202021221221 its reverse (1221221202021), we get a palindrome (2423242423242).

The spelling of 1202021221221 in words is "one trillion, two hundred two billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".