20213021011123 has 2 divisors, whose sum is σ = 20213021011124. Its totient is φ = 20213021011122.

The previous prime is 20213021011067. The next prime is 20213021011177. The reversal of 20213021011123 is 32111012031202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213021011123 is a prime.

It is a super-2 number, since 2×20213021011123² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20213021011123.

It is not a weakly prime, because it can be changed into another prime (20213021011723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106510505561 + 10106510505562.

It is an arithmetic number, because the mean of its divisors is an integer number (10106510505562).

Almost surely, 2^{20213021011123} is an apocalyptic number.

20213021011123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213021011123 is an equidigital number, since it uses as much as digits as its factorization.

20213021011123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20213021011123 its reverse (32111012031202), we get a palindrome (52324033042325).

The spelling of 20213021011123 in words is "twenty trillion, two hundred thirteen billion, twenty-one million, eleven thousand, one hundred twenty-three".