212102412121 has 4 divisors (see below), whose sum is σ = 212394163072. Its totient is φ = 211810661172.

The previous prime is 212102412097. The next prime is 212102412127. The reversal of 212102412121 is 121214201212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212102412121 - 2²³ = 212094023513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212102412127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145874385 + ... + 145875838.

It is an arithmetic number, because the mean of its divisors is an integer number (53098540768).

Almost surely, 2^212102412121 is an apocalyptic number.

It is an amenable number.

212102412121 is a deficient number, since it is larger than the sum of its proper divisors (291750951).

212102412121 is an equidigital number, since it uses as much as digits as its factorization.

212102412121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291750950.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212102412121 its reverse (121214201212), we get a palindrome (333316613333).

It can be divided in two parts, 2121024 and 12121, that added together give a triangular number (2133145 = T₂₀₆₅).

The spelling of 212102412121 in words is "two hundred twelve billion, one hundred two million, four hundred twelve thousand, one hundred twenty-one".