20021212011009 has 32 divisors (see below), whose sum is σ = 29736171172224. Its totient is φ = 11880491028480.

The previous prime is 20021212010959. The next prime is 20021212011041. The reversal of 20021212011009 is 90011021212002.

It is not a de Polignac number, because 20021212011009 - 2²⁵ = 20021178456577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021212011109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30002104 + ... + 30662169.

It is an arithmetic number, because the mean of its divisors is an integer number (929255349132).

Almost surely, 2^{20021212011009} is an apocalyptic number.

It is an amenable number.

20021212011009 is a deficient number, since it is larger than the sum of its proper divisors (9714959161215).

20021212011009 is a wasteful number, since it uses less digits than its factorization.

20021212011009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60664497.

The product of its (nonzero) digits is 144, while the sum is 21.

It can be divided in two parts, 200212 and 12011009, that added together give a palindrome (12211221).

The spelling of 20021212011009 in words is "twenty trillion, twenty-one billion, two hundred twelve million, eleven thousand, nine".