311221210202012 has 144 divisors (see below), whose sum is σ = 621893042360352. Its totient is φ = 136107470400000.

The previous prime is 311221210201961. The next prime is 311221210202027. The reversal of 311221210202012 is 210202012122113.

It is a super-3 number, since 3×311221210202012³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 246870962 + ... + 248128422.

It is an arithmetic number, because the mean of its divisors is an integer number (4318701683058).

Almost surely, 2^{311221210202012} is an apocalyptic number.

It is an amenable number.

311221210202012 is a deficient number, since it is larger than the sum of its proper divisors (310671832158340).

311221210202012 is a wasteful number, since it uses less digits than its factorization.

311221210202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257732 (or 1257719 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 311221210202012 its reverse (210202012122113), we get a palindrome (521423222324125).

The spelling of 311221210202012 in words is "three hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, two hundred two thousand, twelve".