212210002121 has 4 divisors (see below), whose sum is σ = 228533848452. Its totient is φ = 195886155792.

The previous prime is 212210002093. The next prime is 212210002133. The reversal of 212210002121 is 121200012212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83570137225 + 128639864896 = 289085^2 + 358664^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210002121 - 2²² = 212205807817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210002096 and 212210002105.

It is not an unprimeable number, because it can be changed into a prime (212210002421) 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, 8161923146 + ... + 8161923171.

It is an arithmetic number, because the mean of its divisors is an integer number (57133462113).

Almost surely, 2^212210002121 is an apocalyptic number.

It is an amenable number.

212210002121 is a deficient number, since it is larger than the sum of its proper divisors (16323846331).

212210002121 is a wasteful number, since it uses less digits than its factorization.

212210002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16323846330.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212210002121 its reverse (121200012212), we get a palindrome (333410014333).

The spelling of 212210002121 in words is "two hundred twelve billion, two hundred ten million, two thousand, one hundred twenty-one".