20021021212101 has 64 divisors (see below), whose sum is σ = 33376017776640. Its totient is φ = 10394354937600.

The previous prime is 20021021212069. The next prime is 20021021212121. The reversal of 20021021212101 is 10121212012002.

It is not a de Polignac number, because 20021021212101 - 2⁵ = 20021021212069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021212121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2265436 + ... + 6721178.

It is an arithmetic number, because the mean of its divisors is an integer number (521500277760).

Almost surely, 2^{20021021212101} is an apocalyptic number.

20021021212101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20021021212101 is a deficient number, since it is larger than the sum of its proper divisors (13354996564539).

20021021212101 is a wasteful number, since it uses less digits than its factorization.

20021021212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456026.

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

Adding to 20021021212101 its reverse (10121212012002), we get a palindrome (30142233224103).

The spelling of 20021021212101 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred twelve thousand, one hundred one".