1251134110420 has 24 divisors (see below), whose sum is σ = 2627417205000. Its totient is φ = 500446868352.

The previous prime is 1251134110403. The next prime is 1251134110453. The reversal of 1251134110420 is 240114311521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 162091591236 + 1089042519184 = 402606^2 + 1043572^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1252366 + ... + 2017594.

It is an arithmetic number, because the mean of its divisors is an integer number (109475716875).

Almost surely, 2^{1251134110420} is an apocalyptic number.

1251134110420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251134110420 is an abundant number, since it is smaller than the sum of its proper divisors (1376283094580).

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

1251134110420 is a wasteful number, since it uses less digits than its factorization.

1251134110420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846987 (or 846985 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 1251134110420 its reverse (240114311521), we get a palindrome (1491248421941).

The spelling of 1251134110420 in words is "one trillion, two hundred fifty-one billion, one hundred thirty-four million, one hundred ten thousand, four hundred twenty".