1251134220050 has 192 divisors, whose sum is σ = 2782498158720. Its totient is φ = 412521984000.

The previous prime is 1251134220029. The next prime is 1251134220131. The reversal of 1251134220050 is 500224311521.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 440073929 + ... + 440076771.

It is an arithmetic number, because the mean of its divisors is an integer number (14492177910).

Almost surely, 2^{1251134220050} is an apocalyptic number.

1251134220050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251134220050 is an abundant number, since it is smaller than the sum of its proper divisors (1531363938670).

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

1251134220050 is a wasteful number, since it uses less digits than its factorization.

1251134220050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949 (or 3944 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 1251134220050 its reverse (500224311521), we get a palindrome (1751358531571).

The spelling of 1251134220050 in words is "one trillion, two hundred fifty-one billion, one hundred thirty-four million, two hundred twenty thousand, fifty".