121221020212 has 12 divisors (see below), whose sum is σ = 212186977380. Its totient is φ = 60596169536.

The previous prime is 121221020203. The next prime is 121221020251. The reversal of 121221020212 is 212020122121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 61525825936 + 59695194276 = 248044^2 + 244326^2 .

It is a super-2 number, since 2×121221020212² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566113 + ... + 3599944.

It is an arithmetic number, because the mean of its divisors is an integer number (17682248115).

Almost surely, 2^121221020212 is an apocalyptic number.

It is an amenable number.

121221020212 is a deficient number, since it is larger than the sum of its proper divisors (90965957168).

121221020212 is a wasteful number, since it uses less digits than its factorization.

121221020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170290 (or 7170288 counting only the distinct ones).

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

Adding to 121221020212 its reverse (212020122121), we get a palindrome (333241142333).

The spelling of 121221020212 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred twelve".