20121211267 has 2 divisors, whose sum is σ = 20121211268. Its totient is φ = 20121211266.

The previous prime is 20121211171. The next prime is 20121211273. The reversal of 20121211267 is 76211212102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121211267 - 2⁷ = 20121211139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121211667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060605633 + 10060605634.

It is an arithmetic number, because the mean of its divisors is an integer number (10060605634).

Almost surely, 2^20121211267 is an apocalyptic number.

20121211267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121211267 is an equidigital number, since it uses as much as digits as its factorization.

20121211267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 20121211267 its reverse (76211212102), we get a palindrome (96332423369).

The spelling of 20121211267 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred sixty-seven".