21201021011123 has 2 divisors, whose sum is σ = 21201021011124. Its totient is φ = 21201021011122.

The previous prime is 21201021011059. The next prime is 21201021011161. The reversal of 21201021011123 is 32111012010212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201021011123 - 2⁶ = 21201021011059 is a prime.

It is a super-2 number, since 2×21201021011123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21201021011623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600510505561 + 10600510505562.

It is an arithmetic number, because the mean of its divisors is an integer number (10600510505562).

Almost surely, 2^{21201021011123} is an apocalyptic number.

21201021011123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201021011123 is an equidigital number, since it uses as much as digits as its factorization.

21201021011123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21201021011123 its reverse (32111012010212), we get a palindrome (53312033021335).

The spelling of 21201021011123 in words is "twenty-one trillion, two hundred one billion, twenty-one million, eleven thousand, one hundred twenty-three".