2221210202121 has 16 divisors (see below), whose sum is σ = 3302392403520. Its totient is φ = 1475537021280.

The previous prime is 2221210202083. The next prime is 2221210202171. The reversal of 2221210202121 is 1212020121222.

It is a happy number.

2221210202121 is a `hidden beast` number, since 2 + 221 + 210 + 20 + 212 + 1 = 666.

It is not a de Polignac number, because 2221210202121 - 2⁷ = 2221210201993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221210202094 and 2221210202103.

It is not an unprimeable number, because it can be changed into a prime (2221210202171) 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, 146375055 + ... + 146390228.

It is an arithmetic number, because the mean of its divisors is an integer number (206399525220).

Almost surely, 2^{2221210202121} is an apocalyptic number.

It is an amenable number.

2221210202121 is a deficient number, since it is larger than the sum of its proper divisors (1081182201399).

2221210202121 is a wasteful number, since it uses less digits than its factorization.

2221210202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292765573 (or 292765567 counting only the distinct ones).

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

Adding to 2221210202121 its reverse (1212020121222), we get a palindrome (3433230323343).

The spelling of 2221210202121 in words is "two trillion, two hundred twenty-one billion, two hundred ten million, two hundred two thousand, one hundred twenty-one".