1220102122221 has 12 divisors (see below), whose sum is σ = 1810001346972. Its totient is φ = 791417592576.

The previous prime is 1220102122189. The next prime is 1220102122223. The reversal of 1220102122221 is 1222212010221.

It is a happy number.

1220102122221 is a `hidden beast` number, since 1 + 220 + 10 + 212 + 2 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1149053219721 + 71048902500 = 1071939^2 + 266550^2 .

It is not a de Polignac number, because 1220102122221 - 2⁵ = 1220102122189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220102122194 and 1220102122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220102122223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1831984836 + ... + 1831985501.

It is an arithmetic number, because the mean of its divisors is an integer number (150833445581).

Almost surely, 2^{1220102122221} is an apocalyptic number.

It is an amenable number.

1220102122221 is a deficient number, since it is larger than the sum of its proper divisors (589899224751).

1220102122221 is a wasteful number, since it uses less digits than its factorization.

1220102122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663970380 (or 3663970377 counting only the distinct ones).

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

Adding to 1220102122221 its reverse (1222212010221), we get a palindrome (2442314132442).

The spelling of 1220102122221 in words is "one trillion, two hundred twenty billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-one".