21021212120122 has 8 divisors (see below), whose sum is σ = 31532191816500. Its totient is φ = 10510481514624.

The previous prime is 21021212120099. The next prime is 21021212120147. The reversal of 21021212120122 is 22102121212012.

It can be written as a sum of positive squares in 2 ways, for example, as 20961847284921 + 59364835201 = 4578411^2 + 243649^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21021212120122.

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, 62061597 + ... + 62399392.

Almost surely, 2^{21021212120122} is an apocalyptic number.

21021212120122 is a deficient number, since it is larger than the sum of its proper divisors (10510979696378).

21021212120122 is a wasteful number, since it uses less digits than its factorization.

21021212120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124545440.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021212120122 its reverse (22102121212012), we get a palindrome (43123333332134).

It can be divided in two parts, 2102121212012 and 2, that multiplied together give a palindrome (4204242424024).

The spelling of 21021212120122 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred twenty-two".