1231021121004 has 96 divisors (see below), whose sum is σ = 3360808281600. Its totient is φ = 388593495360.

The previous prime is 1231021120997. The next prime is 1231021121047. The reversal of 1231021121004 is 4001211201321.

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 31 ways as a sum of consecutive naturals, for example, 5263849 + ... + 5492735.

It is an arithmetic number, because the mean of its divisors is an integer number (35008419600).

Almost surely, 2^{1231021121004} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231021121004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680404140800).

1231021121004 is an abundant number, since it is smaller than the sum of its proper divisors (2129787160596).

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

1231021121004 is a wasteful number, since it uses less digits than its factorization.

1231021121004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231540 (or 231532 counting only the distinct ones).

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

Adding to 1231021121004 its reverse (4001211201321), we get a palindrome (5232232322325).

The spelling of 1231021121004 in words is "one trillion, two hundred thirty-one billion, twenty-one million, one hundred twenty-one thousand, four".