1221040425044 has 24 divisors (see below), whose sum is σ = 2331158483808. Its totient is φ = 554999015840.

The previous prime is 1221040425037. The next prime is 1221040425049. The reversal of 1221040425044 is 4405240401221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221040424998 and 1221040425016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221040425049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832019 + ... + 1770405.

It is an arithmetic number, because the mean of its divisors is an integer number (97131603492).

Almost surely, 2^{1221040425044} is an apocalyptic number.

It is an amenable number.

1221040425044 is a deficient number, since it is larger than the sum of its proper divisors (1110118058764).

1221040425044 is a wasteful number, since it uses less digits than its factorization.

1221040425044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967975 (or 967973 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 1221040425044 its reverse (4405240401221), we get a palindrome (5626280826265).

The spelling of 1221040425044 in words is "one trillion, two hundred twenty-one billion, forty million, four hundred twenty-five thousand, forty-four".