251002441020 has 96 divisors (see below), whose sum is σ = 709903660032. Its totient is φ = 66259565568.

The previous prime is 251002441013. The next prime is 251002441061. The reversal of 251002441020 is 20144200152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5557449 + ... + 5602431.

It is an arithmetic number, because the mean of its divisors is an integer number (7394829792).

Almost surely, 2^251002441020 is an apocalyptic number.

251002441020 is a gapful number since it is divisible by the number (20) 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 251002441020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354951830016).

251002441020 is an abundant number, since it is smaller than the sum of its proper divisors (458901219012).

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

251002441020 is a wasteful number, since it uses less digits than its factorization.

251002441020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45931 (or 45929 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 251002441020 its reverse (20144200152), we get a palindrome (271146641172).

The spelling of 251002441020 in words is "two hundred fifty-one billion, two million, four hundred forty-one thousand, twenty".