20002121224 has 8 divisors (see below), whose sum is σ = 37503977310. Its totient is φ = 10001060608.

The previous prime is 20002121203. The next prime is 20002121231. The reversal of 20002121224 is 42212120002.

It can be written as a sum of positive squares in only one way, i.e., 19465272324 + 536848900 = 139518^2 + 23170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20002121198 and 20002121207.

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, 1250132569 + ... + 1250132584.

Almost surely, 2^20002121224 is an apocalyptic number.

It is an amenable number.

20002121224 is a deficient number, since it is larger than the sum of its proper divisors (17501856086).

20002121224 is a wasteful number, since it uses less digits than its factorization.

20002121224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500265159 (or 2500265155 counting only the distinct ones).

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

Adding to 20002121224 its reverse (42212120002), we get a palindrome (62214241226).

The spelling of 20002121224 in words is "twenty billion, two million, one hundred twenty-one thousand, two hundred twenty-four".