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53350421 = 128941389
BaseRepresentation
bin1100101110000…
…1000000010101
310201101111000112
43023201000111
5102124203141
65143252405
71215320405
oct313410025
9121344015
1053350421
1128129a63
1215a4a105
13b08c3c7
14712a805
154a3c7eb
hex32e1015

53350421 has 4 divisors (see below), whose sum is σ = 53393100. Its totient is φ = 53307744.

The previous prime is 53350399. The next prime is 53350439. The reversal of 53350421 is 12405335.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12405335 = 52481067.

It can be written as a sum of positive squares in 2 ways, for example, as 40462321 + 12888100 = 6361^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 53350421 - 222 = 49156117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53350021) 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, 19406 + ... + 21983.

It is an arithmetic number, because the mean of its divisors is an integer number (13348275).

Almost surely, 253350421 is an apocalyptic number.

It is an amenable number.

53350421 is a deficient number, since it is larger than the sum of its proper divisors (42679).

53350421 is a wasteful number, since it uses less digits than its factorization.

53350421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42678.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 53350421 is about 7304.1372522701. The cubic root of 53350421 is about 376.4546075348.

Adding to 53350421 its reverse (12405335), we get a palindrome (65755756).

The spelling of 53350421 in words is "fifty-three million, three hundred fifty thousand, four hundred twenty-one".

Divisors: 1 1289 41389 53350421