75020367921 has 16 divisors (see below), whose sum is σ = 104440709760. Its totient is φ = 47809491840.

The previous prime is 75020367913. The next prime is 75020367937. The reversal of 75020367921 is 12976302057.

It is not a de Polignac number, because 75020367921 - 2³ = 75020367913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75020367901) 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, 223516 + ... + 447213.

It is an arithmetic number, because the mean of its divisors is an integer number (6527544360).

Almost surely, 2^75020367921 is an apocalyptic number.

It is an amenable number.

75020367921 is a deficient number, since it is larger than the sum of its proper divisors (29420341839).

75020367921 is a wasteful number, since it uses less digits than its factorization.

75020367921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672376.

The product of its (nonzero) digits is 158760, while the sum is 42.

Adding to 75020367921 its reverse (12976302057), we get a palindrome (87996669978).

The spelling of 75020367921 in words is "seventy-five billion, twenty million, three hundred sixty-seven thousand, nine hundred twenty-one".