20112100021421 has 2 divisors, whose sum is σ = 20112100021422. Its totient is φ = 20112100021420.

The previous prime is 20112100021411. The next prime is 20112100021427. The reversal of 20112100021421 is 12412000121102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19604748675625 + 507351345796 = 4427725^2 + 712286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112100021421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20112100021421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112100021427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056050010710 + 10056050010711.

It is an arithmetic number, because the mean of its divisors is an integer number (10056050010711).

Almost surely, 2^{20112100021421} is an apocalyptic number.

It is an amenable number.

20112100021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112100021421 is an equidigital number, since it uses as much as digits as its factorization.

20112100021421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20112100021421 its reverse (12412000121102), we get a palindrome (32524100142523).

The spelling of 20112100021421 in words is "twenty trillion, one hundred twelve billion, one hundred million, twenty-one thousand, four hundred twenty-one".