2131545420 has 72 divisors (see below), whose sum is σ = 6484405200. Its totient is φ = 566766720.

The previous prime is 2131545413. The next prime is 2131545431. The reversal of 2131545420 is 245451312.

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 23 ways as a sum of consecutive naturals, for example, 45855 + ... + 79785.

Almost surely, 2^2131545420 is an apocalyptic number.

2131545420 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 2131545420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3242202600).

2131545420 is an abundant number, since it is smaller than the sum of its proper divisors (4352859780).

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

2131545420 is a wasteful number, since it uses less digits than its factorization.

2131545420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34295 (or 34290 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2131545420 is about 46168.6627486654. The cubic root of 2131545420 is about 1286.9594515980.

Adding to 2131545420 its reverse (245451312), we get a palindrome (2376996732).

The spelling of 2131545420 in words is "two billion, one hundred thirty-one million, five hundred forty-five thousand, four hundred twenty".