1211212020212 has 6 divisors (see below), whose sum is σ = 2119621035378. Its totient is φ = 605606010104.

The previous prime is 1211212020211. The next prime is 1211212020233. The reversal of 1211212020212 is 2120202121121.

It can be written as a sum of positive squares in only one way, i.e., 912949674256 + 298262345956 = 955484^2 + 546134^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212020211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151401502523 + ... + 151401502530.

It is an arithmetic number, because the mean of its divisors is an integer number (353270172563).

Almost surely, 2^{1211212020212} is an apocalyptic number.

It is an amenable number.

1211212020212 is a deficient number, since it is larger than the sum of its proper divisors (908409015166).

1211212020212 is a wasteful number, since it uses less digits than its factorization.

1211212020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302803005057 (or 302803005055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211212020212 its reverse (2120202121121), we get a palindrome (3331414141333).

The spelling of 1211212020212 in words is "one trillion, two hundred eleven billion, two hundred twelve million, twenty thousand, two hundred twelve".