245421513220 has 96 divisors (see below), whose sum is σ = 567754887168. Its totient is φ = 88561009152.

The previous prime is 245421513199. The next prime is 245421513241. The reversal of 245421513220 is 22315124542.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (245421513199) and next prime (245421513241).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2156874 + ... + 2267806.

It is an arithmetic number, because the mean of its divisors is an integer number (5914113408).

Almost surely, 2^245421513220 is an apocalyptic number.

245421513220 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 245421513220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283877443584).

245421513220 is an abundant number, since it is smaller than the sum of its proper divisors (322333373948).

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

245421513220 is a wasteful number, since it uses less digits than its factorization.

245421513220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111149 (or 111147 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 245421513220 its reverse (22315124542), we get a palindrome (267736637762).

It can be divided in two parts, 245421 and 513220, that added together give a square (758641 = 871²).

The spelling of 245421513220 in words is "two hundred forty-five billion, four hundred twenty-one million, five hundred thirteen thousand, two hundred twenty".