1251423105042 has 128 divisors (see below), whose sum is σ = 2929250304000. Its totient is φ = 352193587200.

The previous prime is 1251423105011. The next prime is 1251423105061. The reversal of 1251423105042 is 2405013241521.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 229658334 + ... + 229663782.

It is an arithmetic number, because the mean of its divisors is an integer number (22884768000).

Almost surely, 2^{1251423105042} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251423105042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1464625152000).

1251423105042 is an abundant number, since it is smaller than the sum of its proper divisors (1677827198958).

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

1251423105042 is a wasteful number, since it uses less digits than its factorization.

1251423105042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8152.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1251423105042 its reverse (2405013241521), we get a palindrome (3656436346563).

The spelling of 1251423105042 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-three million, one hundred five thousand, forty-two".