20421122 has 4 divisors (see below), whose sum is σ = 30631686. Its totient is φ = 10210560.

The previous prime is 20421103. The next prime is 20421179. The reversal of 20421122 is 22112402.

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., 17799961 + 2621161 = 4219^2 + 1619^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20421097 and 20421106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105279 + ... + 5105282.

Almost surely, 2^20421122 is an apocalyptic number.

20421122 is a deficient number, since it is larger than the sum of its proper divisors (10210564).

20421122 is a wasteful number, since it uses less digits than its factorization.

20421122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210563.

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

The square root of 20421122 is about 4518.9735560191. The cubic root of 20421122 is about 273.3337124061. Note that the first 3 decimals are identical.

Adding to 20421122 its reverse (22112402), we get a palindrome (42533524).

The spelling of 20421122 in words is "twenty million, four hundred twenty-one thousand, one hundred twenty-two".