210020121131123 has 24 divisors (see below), whose sum is σ = 231303433610880. Its totient is φ = 190454345948160.

The previous prime is 210020121131071. The next prime is 210020121131129. The reversal of 210020121131123 is 321131121020012.

It is not a de Polignac number, because 210020121131123 - 2¹⁸ = 210020120868979 is a prime.

It is a super-2 number, since 2×210020121131123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210020121131095 and 210020121131104.

It is not an unprimeable number, because it can be changed into a prime (210020121131129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49132586 + ... + 53235807.

It is an arithmetic number, because the mean of its divisors is an integer number (9637643067120).

Almost surely, 2^{210020121131123} is an apocalyptic number.

210020121131123 is a deficient number, since it is larger than the sum of its proper divisors (21283312479757).

210020121131123 is a wasteful number, since it uses less digits than its factorization.

210020121131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102368687 (or 102368670 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 210020121131123 its reverse (321131121020012), we get a palindrome (531151242151135).

The spelling of 210020121131123 in words is "two hundred ten trillion, twenty billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred twenty-three".