12511022420 has 48 divisors (see below), whose sum is σ = 28452332160. Its totient is φ = 4593630336.

The previous prime is 12511022333. The next prime is 12511022423. The reversal of 12511022420 is 2422011521.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12511022392 and 12511022401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12511022423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87872 + ... + 180951.

It is an arithmetic number, because the mean of its divisors is an integer number (592756920).

Almost surely, 2^12511022420 is an apocalyptic number.

12511022420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12511022420 is an abundant number, since it is smaller than the sum of its proper divisors (15941309740).

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

12511022420 is a wasteful number, since it uses less digits than its factorization.

12511022420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269024 (or 269022 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 12511022420 its reverse (2422011521), we get a palindrome (14933033941).

The spelling of 12511022420 in words is "twelve billion, five hundred eleven million, twenty-two thousand, four hundred twenty".