53129021 has 4 divisors (see below), whose sum is σ = 57958944. Its totient is φ = 48299100.

The previous prime is 53128993. The next prime is 53129033. The reversal of 53129021 is 12092135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53129021 - 2¹⁴ = 53112637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53129051) 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, 2414945 + ... + 2414966.

It is an arithmetic number, because the mean of its divisors is an integer number (14489736).

Almost surely, 2^53129021 is an apocalyptic number.

It is an amenable number.

53129021 is a deficient number, since it is larger than the sum of its proper divisors (4829923).

53129021 is a wasteful number, since it uses less digits than its factorization.

53129021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829922.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 53129021 is about 7288.9657016617. The cubic root of 53129021 is about 375.9331332919.

The spelling of 53129021 in words is "fifty-three million, one hundred twenty-nine thousand, twenty-one".