53121540 has 24 divisors (see below), whose sum is σ = 148740480. Its totient is φ = 14165728.

The previous prime is 53121539. The next prime is 53121557. The reversal of 53121540 is 4512135.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442620 + ... + 442739.

It is an arithmetic number, because the mean of its divisors is an integer number (6197520).

Almost surely, 2^53121540 is an apocalyptic number.

It is an amenable number.

53121540 is an abundant number, since it is smaller than the sum of its proper divisors (95618940).

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

53121540 is a wasteful number, since it uses less digits than its factorization.

53121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885371 (or 885369 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 53121540 is about 7288.4525106500. The cubic root of 53121540 is about 375.9154876453.

Adding to 53121540 its reverse (4512135), we get a palindrome (57633675).

The spelling of 53121540 in words is "fifty-three million, one hundred twenty-one thousand, five hundred forty".