20021312212 has 24 divisors (see below), whose sum is σ = 38226091680. Its totient is φ = 9099742560.

The previous prime is 20021312197. The next prime is 20021312221. The reversal of 20021312212 is 21221312002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891214 + ... + 913402.

It is an arithmetic number, because the mean of its divisors is an integer number (1592753820).

Almost surely, 2^20021312212 is an apocalyptic number.

20021312212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20021312212 is a deficient number, since it is larger than the sum of its proper divisors (18204779468).

20021312212 is a wasteful number, since it uses less digits than its factorization.

20021312212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42711 (or 42709 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20021312212 its reverse (21221312002), we get a palindrome (41242624214).

It can be divided in two parts, 20021 and 312212, that added together give a palindrome (332233).

The spelling of 20021312212 in words is "twenty billion, twenty-one million, three hundred twelve thousand, two hundred twelve".