221020002122 has 4 divisors (see below), whose sum is σ = 331530003186. Its totient is φ = 110510001060.

The previous prime is 221020002121. The next prime is 221020002163. The reversal of 221020002122 is 221200020122.

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., 220065130321 + 954871801 = 469111^2 + 30901^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221020002097 and 221020002106.

It is not an unprimeable number, because it can be changed into a prime (221020002121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55255000529 + ... + 55255000532.

Almost surely, 2^221020002122 is an apocalyptic number.

221020002122 is a deficient number, since it is larger than the sum of its proper divisors (110510001064).

221020002122 is a wasteful number, since it uses less digits than its factorization.

221020002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110510001063.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221020002122 its reverse (221200020122), we get a palindrome (442220022244).

The spelling of 221020002122 in words is "two hundred twenty-one billion, twenty million, two thousand, one hundred twenty-two".