72174021 has 4 divisors (see below), whose sum is σ = 96232032. Its totient is φ = 48116012.

The previous prime is 72174017. The next prime is 72174029. The reversal of 72174021 is 12047127.

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 72174021 - 2² = 72174017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72173982 and 72174000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72174029) 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, 12029001 + ... + 12029006.

It is an arithmetic number, because the mean of its divisors is an integer number (24058008).

Almost surely, 2^72174021 is an apocalyptic number.

It is an amenable number.

72174021 is a deficient number, since it is larger than the sum of its proper divisors (24058011).

72174021 is a wasteful number, since it uses less digits than its factorization.

72174021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24058010.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 72174021 is about 8495.5294714338. The cubic root of 72174021 is about 416.3516600077.

The spelling of 72174021 in words is "seventy-two million, one hundred seventy-four thousand, twenty-one".