311221121004 has 18 divisors (see below), whose sum is σ = 786697833740. Its totient is φ = 103740373656.

The previous prime is 311221120961. The next prime is 311221121011. The reversal of 311221121004 is 400121122113.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×311221121004³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4322515534 + ... + 4322515605.

Almost surely, 2^311221121004 is an apocalyptic number.

It is an amenable number.

311221121004 is an abundant number, since it is smaller than the sum of its proper divisors (475476712736).

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

311221121004 is a wasteful number, since it uses less digits than its factorization.

311221121004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8645031149 (or 8645031144 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 311221121004 its reverse (400121122113), we get a palindrome (711342243117).

The spelling of 311221121004 in words is "three hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, four".