251411040220 has 48 divisors (see below), whose sum is σ = 535479916608. Its totient is φ = 99141209600.

The previous prime is 251411040187. The next prime is 251411040233. The reversal of 251411040220 is 22040114152.

It is a super-2 number, since 2×251411040220² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251411040191 and 251411040200.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 203577 + ... + 737743.

It is an arithmetic number, because the mean of its divisors is an integer number (11155831596).

Almost surely, 2^251411040220 is an apocalyptic number.

251411040220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251411040220 is an abundant number, since it is smaller than the sum of its proper divisors (284068876388).

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

251411040220 is a wasteful number, since it uses less digits than its factorization.

251411040220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534510 (or 534508 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 251411040220 its reverse (22040114152), we get a palindrome (273451154372).

The spelling of 251411040220 in words is "two hundred fifty-one billion, four hundred eleven million, forty thousand, two hundred twenty".