75147021 has 24 divisors (see below), whose sum is σ = 119193984. Its totient is φ = 47148480.

The previous prime is 75147001. The next prime is 75147041. The reversal of 75147021 is 12074157.

It is an interprime number because it is at equal distance from previous prime (75147001) and next prime (75147041).

It is not a de Polignac number, because 75147021 - 2⁷ = 75146893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75147001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4965 + ... + 13226.

It is an arithmetic number, because the mean of its divisors is an integer number (4966416).

Almost surely, 2^75147021 is an apocalyptic number.

It is an amenable number.

75147021 is a deficient number, since it is larger than the sum of its proper divisors (44046963).

75147021 is a wasteful number, since it uses less digits than its factorization.

75147021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18223 (or 18211 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 75147021 is about 8668.7381434670. The cubic root of 75147021 is about 421.9917134855.

It can be divided in two parts, 7514 and 7021, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 75147021 in words is "seventy-five million, one hundred forty-seven thousand, twenty-one".