20012021212111 has 2 divisors, whose sum is σ = 20012021212112. Its totient is φ = 20012021212110.

The previous prime is 20012021212087. The next prime is 20012021212181. The reversal of 20012021212111 is 11121212021002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012021212111 - 2¹³ = 20012021203919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012021212181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006010606055 + 10006010606056.

It is an arithmetic number, because the mean of its divisors is an integer number (10006010606056).

Almost surely, 2^{20012021212111} is an apocalyptic number.

20012021212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012021212111 is an equidigital number, since it uses as much as digits as its factorization.

20012021212111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20012021212111 its reverse (11121212021002), we get a palindrome (31133233233113).

The spelling of 20012021212111 in words is "twenty trillion, twelve billion, twenty-one million, two hundred twelve thousand, one hundred eleven".