74911021 has 4 divisors (see below), whose sum is σ = 75611232. Its totient is φ = 74210812.

The previous prime is 74911007. The next prime is 74911037. The reversal of 74911021 is 12011947.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12011947 = 1459 ⋅8233.

It is a cyclic number.

It is not a de Polignac number, because 74911021 - 2¹⁹ = 74386733 is a prime.

It is a super-2 number, since 2×74911021² = 11223322134524882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74915021) 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, 349945 + ... + 350158.

It is an arithmetic number, because the mean of its divisors is an integer number (18902808).

Almost surely, 2^74911021 is an apocalyptic number.

It is an amenable number.

74911021 is a deficient number, since it is larger than the sum of its proper divisors (700211).

74911021 is a wasteful number, since it uses less digits than its factorization.

74911021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700210.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 74911021 is about 8655.1153083018. The cubic root of 74911021 is about 421.5494937769.

Adding to 74911021 its reverse (12011947), we get a palindrome (86922968).

The spelling of 74911021 in words is "seventy-four million, nine hundred eleven thousand, twenty-one".