102121110125 has 16 divisors (see below), whose sum is σ = 134944039152. Its totient is φ = 76891187200.

The previous prime is 102121110109. The next prime is 102121110127. The reversal of 102121110125 is 521011121201.

It can be written as a sum of positive squares in 8 ways, for example, as 49107889609 + 53013220516 = 221603^2 + 230246^2 .

It is not a de Polignac number, because 102121110125 - 2⁴ = 102121110109 is a prime.

It is a super-2 number, since 2×102121110125² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121110127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24026372 + ... + 24030621.

It is an arithmetic number, because the mean of its divisors is an integer number (8434002447).

Almost surely, 2^102121110125 is an apocalyptic number.

It is an amenable number.

102121110125 is a deficient number, since it is larger than the sum of its proper divisors (32822929027).

102121110125 is an equidigital number, since it uses as much as digits as its factorization.

102121110125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48057025 (or 48057015 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 102121110125 its reverse (521011121201), we get a palindrome (623132231326).

The spelling of 102121110125 in words is "one hundred two billion, one hundred twenty-one million, one hundred ten thousand, one hundred twenty-five".