202121210212 has 6 divisors (see below), whose sum is σ = 353712117878. Its totient is φ = 101060605104.

The previous prime is 202121210197. The next prime is 202121210219. The reversal of 202121210212 is 212012121202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 133133035876 + 68988174336 = 364874^2 + 262656^2 .

It is not an unprimeable number, because it can be changed into a prime (202121210219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25265151273 + ... + 25265151280.

Almost surely, 2^202121210212 is an apocalyptic number.

It is an amenable number.

202121210212 is a deficient number, since it is larger than the sum of its proper divisors (151590907666).

202121210212 is a wasteful number, since it uses less digits than its factorization.

202121210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50530302557 (or 50530302555 counting only the distinct ones).

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

Adding to 202121210212 its reverse (212012121202), we get a palindrome (414133331414).

The spelling of 202121210212 in words is "two hundred two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twelve".