221012221121122 has 4 divisors (see below), whose sum is σ = 331518331681686. Its totient is φ = 110506110560560.

The previous prime is 221012221121119. The next prime is 221012221121137. The reversal of 221012221121122 is 221121122210122.

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., 144260061310561 + 76752159810561 = 12010831^2 + 8760831^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221012221121093 and 221012221121102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55253055280279 + ... + 55253055280282.

Almost surely, 2^{221012221121122} is an apocalyptic number.

221012221121122 is a deficient number, since it is larger than the sum of its proper divisors (110506110560564).

221012221121122 is a wasteful number, since it uses less digits than its factorization.

221012221121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110506110560563.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221012221121122 its reverse (221121122210122), we get a palindrome (442133343331244).

The spelling of 221012221121122 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-two".