20021212112001 has 4 divisors (see below), whose sum is σ = 26694949482672. Its totient is φ = 13347474741332.

The previous prime is 20021212111987. The next prime is 20021212112003. The reversal of 20021212112001 is 10021121212002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20021212112001 - 2⁹ = 20021212111489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021212112003) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3336868685331 + ... + 3336868685336.

It is an arithmetic number, because the mean of its divisors is an integer number (6673737370668).

Almost surely, 2^{20021212112001} is an apocalyptic number.

It is an amenable number.

20021212112001 is a deficient number, since it is larger than the sum of its proper divisors (6673737370671).

20021212112001 is an equidigital number, since it uses as much as digits as its factorization.

20021212112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673737370670.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021212112001 its reverse (10021121212002), we get a palindrome (30042333324003).

The spelling of 20021212112001 in words is "twenty trillion, twenty-one billion, two hundred twelve million, one hundred twelve thousand, one".