210121011221212 has 48 divisors (see below), whose sum is σ = 452945159058112. Its totient is φ = 83055582489600.

The previous prime is 210121011221171. The next prime is 210121011221221. The reversal of 210121011221212 is 212122110121012.

It is a happy number.

It is a super-4 number, since 4×210121011221212⁴ (a number of 58 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210121011221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239885703 + ... + 240760030.

Almost surely, 2^{210121011221212} is an apocalyptic number.

It is an amenable number.

210121011221212 is an abundant number, since it is smaller than the sum of its proper divisors (242824147836900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210121011221212 is a wasteful number, since it uses less digits than its factorization.

210121011221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480646958 (or 480646956 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210121011221212 its reverse (212122110121012), we get a palindrome (422243121342224).

The spelling of 210121011221212 in words is "two hundred ten trillion, one hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred twelve".