20021212210 has 16 divisors (see below), whose sum is σ = 36128059992. Its totient is φ = 7988512000.

The previous prime is 20021212207. The next prime is 20021212223. The reversal of 20021212210 is 1221212002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19645666569 + 375545641 = 140163^2 + 19379^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2492401 + ... + 2500420.

Almost surely, 2^20021212210 is an apocalyptic number.

20021212210 is a deficient number, since it is larger than the sum of its proper divisors (16106847782).

20021212210 is a wasteful number, since it uses less digits than its factorization.

20021212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993229.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021212210 its reverse (1221212002), we get a palindrome (21242424212).

The spelling of 20021212210 in words is "twenty billion, twenty-one million, two hundred twelve thousand, two hundred ten".