53151421 has 4 divisors (see below), whose sum is σ = 54154332. Its totient is φ = 52148512.

The previous prime is 53151419. The next prime is 53151433. The reversal of 53151421 is 12415135.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12415135 = 5 ⋅2483027.

It can be written as a sum of positive squares in 2 ways, for example, as 23328900 + 29822521 = 4830^2 + 5461^2 .

It is a cyclic number.

It is not a de Polignac number, because 53151421 - 2¹ = 53151419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53151392 and 53151401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53151451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501376 + ... + 501481.

It is an arithmetic number, because the mean of its divisors is an integer number (13538583).

Almost surely, 2^53151421 is an apocalyptic number.

It is an amenable number.

53151421 is a deficient number, since it is larger than the sum of its proper divisors (1002911).

53151421 is a wasteful number, since it uses less digits than its factorization.

53151421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002910.

The product of its digits is 600, while the sum is 22.

The square root of 53151421 is about 7290.5021089085. The cubic root of 53151421 is about 375.9859589030.

Adding to 53151421 its reverse (12415135), we get a palindrome (65566556).

The spelling of 53151421 in words is "fifty-three million, one hundred fifty-one thousand, four hundred twenty-one".