212121102202 has 4 divisors (see below), whose sum is σ = 318181653306. Its totient is φ = 106060551100.

The previous prime is 212121102143. The next prime is 212121102251. The reversal of 212121102202 is 202201121212.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 186588577681 + 25532524521 = 431959^2 + 159789^2 .

It is a super-3 number, since 3×212121102202³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53030275549 + ... + 53030275552.

Almost surely, 2^212121102202 is an apocalyptic number.

212121102202 is a deficient number, since it is larger than the sum of its proper divisors (106060551104).

212121102202 is a wasteful number, since it uses less digits than its factorization.

212121102202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106060551103.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212121102202 its reverse (202201121212), we get a palindrome (414322223414).

The spelling of 212121102202 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred two thousand, two hundred two".