1256021052 has 96 divisors (see below), whose sum is σ = 3477648384. Its totient is φ = 347808000.

The previous prime is 1256021051. The next prime is 1256021093. The reversal of 1256021052 is 2501206521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169693 + ... + 176939.

It is an arithmetic number, because the mean of its divisors is an integer number (36225504).

Almost surely, 2^1256021052 is an apocalyptic number.

1256021052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256021052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1738824192).

1256021052 is an abundant number, since it is smaller than the sum of its proper divisors (2221627332).

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

1256021052 is a wasteful number, since it uses less digits than its factorization.

1256021052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7379 (or 7377 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1256021052 is about 35440.3873003668. The cubic root of 1256021052 is about 1078.9441704683.

Adding to 1256021052 its reverse (2501206521), we get a palindrome (3757227573).

The spelling of 1256021052 in words is "one billion, two hundred fifty-six million, twenty-one thousand, fifty-two".