212210121 has 16 divisors (see below), whose sum is σ = 297244800. Its totient is φ = 134407680.

The previous prime is 212210111. The next prime is 212210129. The reversal of 212210121 is 121012212.

It is not a de Polignac number, because 212210121 - 2⁶ = 212210057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210097 and 212210106.

It is not an unprimeable number, because it can be changed into a prime (212210129) 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, 40 + ... + 20601.

It is an arithmetic number, because the mean of its divisors is an integer number (18577800).

Almost surely, 2^212210121 is an apocalyptic number.

It is an amenable number.

212210121 is a deficient number, since it is larger than the sum of its proper divisors (85034679).

212210121 is a wasteful number, since it uses less digits than its factorization.

212210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212210121 is about 14567.4335763030. The cubic root of 212210121 is about 596.4701268277.

Adding to 212210121 its reverse (121012212), we get a palindrome (333222333).

The spelling of 212210121 in words is "two hundred twelve million, two hundred ten thousand, one hundred twenty-one".