20021102210 has 8 divisors (see below), whose sum is σ = 36037983996. Its totient is φ = 8008440880.

The previous prime is 20021102209. The next prime is 20021102221. The reversal of 20021102210 is 1220112002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18349682521 + 1671419689 = 135461^2 + 40883^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20021102191 and 20021102200.

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, 1001055101 + ... + 1001055120.

Almost surely, 2^20021102210 is an apocalyptic number.

20021102210 is a deficient number, since it is larger than the sum of its proper divisors (16016881786).

20021102210 is a wasteful number, since it uses less digits than its factorization.

20021102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002110228.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021102210 its reverse (1220112002), we get a palindrome (21241214212).

The spelling of 20021102210 in words is "twenty billion, twenty-one million, one hundred two thousand, two hundred ten".