20011220211967 has 2 divisors, whose sum is σ = 20011220211968. Its totient is φ = 20011220211966.

The previous prime is 20011220211953. The next prime is 20011220212103. The reversal of 20011220211967 is 76911202211002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011220211967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011220218967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005610105983 + 10005610105984.

It is an arithmetic number, because the mean of its divisors is an integer number (10005610105984).

Almost surely, 2^{20011220211967} is an apocalyptic number.

20011220211967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011220211967 is an equidigital number, since it uses as much as digits as its factorization.

20011220211967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

Adding to 20011220211967 its reverse (76911202211002), we get a palindrome (96922422422969).

The spelling of 20011220211967 in words is "twenty trillion, eleven billion, two hundred twenty million, two hundred eleven thousand, nine hundred sixty-seven".