20021212121210 has 8 divisors (see below), whose sum is σ = 36038181818196. Its totient is φ = 8008484848480.

The previous prime is 20021212121189. The next prime is 20021212121327. The reversal of 20021212121210 is 1212121212002.

It can be written as a sum of positive squares in 2 ways, for example, as 20012837492041 + 8374629169 = 4473571^2 + 91513^2 .

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

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, 1001060606051 + ... + 1001060606070.

Almost surely, 2^{20021212121210} is an apocalyptic number.

20021212121210 is a deficient number, since it is larger than the sum of its proper divisors (16016969696986).

20021212121210 is a wasteful number, since it uses less digits than its factorization.

20021212121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002121212128.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021212121210 its reverse (1212121212002), we get a palindrome (21233333333212).

The spelling of 20021212121210 in words is "twenty trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred ten".