20123210021267 has 2 divisors, whose sum is σ = 20123210021268. Its totient is φ = 20123210021266.

The previous prime is 20123210021249. The next prime is 20123210021293. The reversal of 20123210021267 is 76212001232102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123210021267 - 2¹⁸ = 20123209759123 is a prime.

It is a super-2 number, since 2×20123210021267² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20123210029267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061605010633 + 10061605010634.

It is an arithmetic number, because the mean of its divisors is an integer number (10061605010634).

Almost surely, 2^{20123210021267} is an apocalyptic number.

20123210021267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123210021267 is an equidigital number, since it uses as much as digits as its factorization.

20123210021267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 20123210021267 its reverse (76212001232102), we get a palindrome (96335211253369).

The spelling of 20123210021267 in words is "twenty trillion, one hundred twenty-three billion, two hundred ten million, twenty-one thousand, two hundred sixty-seven".