210012121 has 16 divisors (see below), whose sum is σ = 234793728.
Its totient is φ = 186208000.
The previous prime is 210012083. The next prime is 210012151. The reversal of 210012121 is 121210012.
It is a de Polignac number, because none of the positive numbers 2k-210012121 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 210012098 and 210012107.
It is not an unprimeable number, because it can be changed into a prime (210012151) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206811 + ... + 207823.
It is an arithmetic number, because the mean of its divisors is an integer number (14674608).
Almost surely, 2210012121 is an apocalyptic number.
It is an amenable number.
210012121 is a deficient number, since it is larger than the sum of its proper divisors (24781607).
210012121 is a wasteful number, since it uses less digits than its factorization.
210012121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1472.
The product of its (nonzero) digits is 8, while the sum is 10.
The square root of 210012121 is about 14491.7949543871.
The cubic root of 210012121 is about 594.4036309734.
Adding to 210012121 its reverse (121210012), we get a palindrome (331222133).
It can be divided in two parts, 210012 and 121, that multiplied together give a palindrome (25411452).
The spelling of 210012121 in words is "two hundred ten million, twelve thousand, one hundred twenty-one".