74270021 has 4 divisors (see below), whose sum is σ = 84880032. Its totient is φ = 63660012.

The previous prime is 74270003. The next prime is 74270023. The reversal of 74270021 is 12007247.

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 74270021 - 2¹⁸ = 74007877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74270023) 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, 5304995 + ... + 5305008.

It is an arithmetic number, because the mean of its divisors is an integer number (21220008).

Almost surely, 2^74270021 is an apocalyptic number.

It is an amenable number.

74270021 is a deficient number, since it is larger than the sum of its proper divisors (10610011).

74270021 is a wasteful number, since it uses less digits than its factorization.

74270021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610010.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 74270021 is about 8618.0056277540. The cubic root of 74270021 is about 420.3436737316.

Adding to 74270021 its reverse (12007247), we get a palindrome (86277268).

The spelling of 74270021 in words is "seventy-four million, two hundred seventy thousand, twenty-one".