2121142540 has 48 divisors (see below), whose sum is σ = 4862501280. Its totient is φ = 770823680.

The previous prime is 2121142519. The next prime is 2121142559. The reversal of 2121142540 is 452411212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598614 + ... + 602146.

It is an arithmetic number, because the mean of its divisors is an integer number (101302110).

Almost surely, 2^2121142540 is an apocalyptic number.

2121142540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121142540 is an abundant number, since it is smaller than the sum of its proper divisors (2741358740).

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

2121142540 is a wasteful number, since it uses less digits than its factorization.

2121142540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282 (or 6280 counting only the distinct ones).

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

The square root of 2121142540 is about 46055.8632532276. The cubic root of 2121142540 is about 1284.8623934768.

Adding to 2121142540 its reverse (452411212), we get a palindrome (2573553752).

The spelling of 2121142540 in words is "two billion, one hundred twenty-one million, one hundred forty-two thousand, five hundred forty".