1210212022221 has 48 divisors (see below), whose sum is σ = 1853697930240. Its totient is φ = 759493428480.

The previous prime is 1210212022199. The next prime is 1210212022231. The reversal of 1210212022221 is 1222202120121.

It is a happy number.

1210212022221 is a `hidden beast` number, since 1 + 210 + 212 + 0 + 22 + 221 = 666.

It is not a de Polignac number, because 1210212022221 - 2⁷ = 1210212022093 is a prime.

It is a super-2 number, since 2×1210212022221² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1210212022194 and 1210212022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210212022231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50766921 + ... + 50790753.

It is an arithmetic number, because the mean of its divisors is an integer number (38618706880).

Almost surely, 2^{1210212022221} is an apocalyptic number.

It is an amenable number.

1210212022221 is a deficient number, since it is larger than the sum of its proper divisors (643485908019).

1210212022221 is a wasteful number, since it uses less digits than its factorization.

1210212022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28826 (or 28823 counting only the distinct ones).

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

Adding to 1210212022221 its reverse (1222202120121), we get a palindrome (2432414142342).

The spelling of 1210212022221 in words is "one trillion, two hundred ten billion, two hundred twelve million, twenty-two thousand, two hundred twenty-one".