21212230422122 has 4 divisors (see below), whose sum is σ = 31818345633186. Its totient is φ = 10606115211060.

The previous prime is 21212230422107. The next prime is 21212230422157. The reversal of 21212230422122 is 22122403221212.

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., 12730045990561 + 8482184431561 = 3567919^2 + 2912419^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21212230422091 and 21212230422100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303057605529 + ... + 5303057605532.

Almost surely, 2^{21212230422122} is an apocalyptic number.

21212230422122 is a deficient number, since it is larger than the sum of its proper divisors (10606115211064).

21212230422122 is a wasteful number, since it uses less digits than its factorization.

21212230422122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606115211063.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21212230422122 its reverse (22122403221212), we get a palindrome (43334633643334).

The spelling of 21212230422122 in words is "twenty-one trillion, two hundred twelve billion, two hundred thirty million, four hundred twenty-two thousand, one hundred twenty-two".