2131222440 has 128 divisors (see below), whose sum is σ = 6489849600. Its totient is φ = 559841280.

The previous prime is 2131222439. The next prime is 2131222447. The reversal of 2131222440 is 442221312.

It is not an unprimeable number, because it can be changed into a prime (2131222447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3324520 + ... + 3325160.

It is an arithmetic number, because the mean of its divisors is an integer number (50701950).

Almost surely, 2^2131222440 is an apocalyptic number.

2131222440 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 2131222440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3244924800).

2131222440 is an abundant number, since it is smaller than the sum of its proper divisors (4358627160).

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

2131222440 is a wasteful number, since it uses less digits than its factorization.

2131222440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2131222440 is about 46165.1647890485. The cubic root of 2131222440 is about 1286.8944466247.

Adding to 2131222440 its reverse (442221312), we get a palindrome (2573443752).

The spelling of 2131222440 in words is "two billion, one hundred thirty-one million, two hundred twenty-two thousand, four hundred forty".