212220111001221 has 24 divisors (see below), whose sum is σ = 311742644447520. Its totient is φ = 139079033460000.

The previous prime is 212220111001211. The next prime is 212220111001273. The reversal of 212220111001221 is 122100111022212.

212220111001221 is a `hidden beast` number, since 212 + 220 + 1 + 1 + 10 + 0 + 1 + 221 = 666.

It is not a de Polignac number, because 212220111001221 - 2³⁷ = 212082672047749 is a prime.

It is a super-2 number, since 2×212220111001221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212220111001194 and 212220111001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220111001211) 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, 19762971 + ... + 28548471.

It is an arithmetic number, because the mean of its divisors is an integer number (12989276851980).

Almost surely, 2^{212220111001221} is an apocalyptic number.

It is an amenable number.

212220111001221 is a deficient number, since it is larger than the sum of its proper divisors (99522533446299).

212220111001221 is a wasteful number, since it uses less digits than its factorization.

212220111001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831057 (or 8831054 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212220111001221 its reverse (122100111022212), we get a palindrome (334320222023433).

The spelling of 212220111001221 in words is "two hundred twelve trillion, two hundred twenty billion, one hundred eleven million, one thousand, two hundred twenty-one".