52605021 has 16 divisors (see below), whose sum is σ = 84875904. Its totient is φ = 28291584.

The previous prime is 52605019. The next prime is 52605037. The reversal of 52605021 is 12050625.

It is not a de Polignac number, because 52605021 - 2¹ = 52605019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52605011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73320 + ... + 74033.

It is an arithmetic number, because the mean of its divisors is an integer number (5304744).

Almost surely, 2^52605021 is an apocalyptic number.

52605021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

52605021 is a deficient number, since it is larger than the sum of its proper divisors (32270883).

52605021 is a wasteful number, since it uses less digits than its factorization.

52605021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147380.

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

The square root of 52605021 is about 7252.9318899325. The cubic root of 52605021 is about 374.6931320651.

Adding to 52605021 its reverse (12050625), we get a palindrome (64655646).

The spelling of 52605021 in words is "fifty-two million, six hundred five thousand, twenty-one".