2121053540 has 24 divisors (see below), whose sum is σ = 4529710080. Its totient is φ = 834040928.

The previous prime is 2121053497. The next prime is 2121053549. The reversal of 2121053540 is 453501212.

It is not an unprimeable number, because it can be changed into a prime (2121053549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897572 + ... + 899931.

It is an arithmetic number, because the mean of its divisors is an integer number (188737920).

Almost surely, 2^2121053540 is an apocalyptic number.

2121053540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121053540 is an abundant number, since it is smaller than the sum of its proper divisors (2408656540).

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

2121053540 is a wasteful number, since it uses less digits than its factorization.

2121053540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797571 (or 1797569 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2121053540 is about 46054.8970251807. The cubic root of 2121053540 is about 1284.8444229176.

Adding to 2121053540 its reverse (453501212), we get a palindrome (2574554752).

The spelling of 2121053540 in words is "two billion, one hundred twenty-one million, fifty-three thousand, five hundred forty".