1245241221042 has 128 divisors (see below), whose sum is σ = 3199818940416. Its totient is φ = 314004759552.

The previous prime is 1245241221011. The next prime is 1245241221043. The reversal of 1245241221042 is 2401221425421.

It is a super-2 number, since 2×1245241221042² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1245241221043) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31915498 + ... + 31954490.

It is an arithmetic number, because the mean of its divisors is an integer number (24998585472).

Almost surely, 2^{1245241221042} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1245241221042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1599909470208).

1245241221042 is an abundant number, since it is smaller than the sum of its proper divisors (1954577719374).

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

1245241221042 is a wasteful number, since it uses less digits than its factorization.

1245241221042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41584.

The product of its (nonzero) digits is 10240, while the sum is 30.

Adding to 1245241221042 its reverse (2401221425421), we get a palindrome (3646462646463).

The spelling of 1245241221042 in words is "one trillion, two hundred forty-five billion, two hundred forty-one million, two hundred twenty-one thousand, forty-two".