21220022122 has 8 divisors (see below), whose sum is σ = 34278497316. Its totient is φ = 9793856352.

The previous prime is 21220022119. The next prime is 21220022137. The reversal of 21220022122 is 22122002212.

It can be written as a sum of positive squares in 2 ways, for example, as 20707497801 + 512524321 = 143901^2 + 22639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21220022096 and 21220022105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408077323 + ... + 408077374.

Almost surely, 2^21220022122 is an apocalyptic number.

21220022122 is a deficient number, since it is larger than the sum of its proper divisors (13058475194).

21220022122 is a wasteful number, since it uses less digits than its factorization.

21220022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816154712.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220022122 its reverse (22122002212), we get a palindrome (43342024334).

It can be divided in two parts, 2122002212 and 2, that multiplied together give a palindrome (4244004424).

The spelling of 21220022122 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred twenty-two".