213222221121 has 64 divisors (see below), whose sum is σ = 359976089088. Its totient is φ = 109241561088.

The previous prime is 213222221117. The next prime is 213222221131. The reversal of 213222221121 is 121122222312.

It is not a de Polignac number, because 213222221121 - 2² = 213222221117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (213222221131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5972095 + ... + 6007691.

It is an arithmetic number, because the mean of its divisors is an integer number (5624626392).

Almost surely, 2^213222221121 is an apocalyptic number.

213222221121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213222221121 is a deficient number, since it is larger than the sum of its proper divisors (146753867967).

213222221121 is a wasteful number, since it uses less digits than its factorization.

213222221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36250.

The product of its digits is 384, while the sum is 21.

Adding to 213222221121 its reverse (121122222312), we get a palindrome (334344443433).

The spelling of 213222221121 in words is "two hundred thirteen billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".