221021211122 has 4 divisors (see below), whose sum is σ = 331531816686. Its totient is φ = 110510605560.

The previous prime is 221021211107. The next prime is 221021211133. The reversal of 221021211122 is 221112120122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 206953116241 + 14068094881 = 454921^2 + 118609^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221021211122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55255302779 + ... + 55255302782.

Almost surely, 2^221021211122 is an apocalyptic number.

221021211122 is a deficient number, since it is larger than the sum of its proper divisors (110510605564).

221021211122 is a wasteful number, since it uses less digits than its factorization.

221021211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110510605563.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021211122 its reverse (221112120122), we get a palindrome (442133331244).

The spelling of 221021211122 in words is "two hundred twenty-one billion, twenty-one million, two hundred eleven thousand, one hundred twenty-two".