20011021212043 has 2 divisors, whose sum is σ = 20011021212044. Its totient is φ = 20011021212042.

The previous prime is 20011021212011. The next prime is 20011021212067. The reversal of 20011021212043 is 34021212011002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011021212043 - 2⁵ = 20011021212011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011021212043.

It is not a weakly prime, because it can be changed into another prime (20011021210043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005510606021 + 10005510606022.

It is an arithmetic number, because the mean of its divisors is an integer number (10005510606022).

Almost surely, 2^{20011021212043} is an apocalyptic number.

20011021212043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011021212043 is an equidigital number, since it uses as much as digits as its factorization.

20011021212043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20011021212043 its reverse (34021212011002), we get a palindrome (54032233223045).

The spelling of 20011021212043 in words is "twenty trillion, eleven billion, twenty-one million, two hundred twelve thousand, forty-three".