74220020021 has 4 divisors (see below), whose sum is σ = 84822880032. Its totient is φ = 63617160012.

The previous prime is 74220020009. The next prime is 74220020033. The reversal of 74220020021 is 12002002247.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (74220020009) and next prime (74220020033).

It is a de Polignac number, because none of the positive numbers 2^k-74220020021 is a prime.

It is a super-2 number, since 2×74220020021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74220019975 and 74220020002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74220020521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5301429995 + ... + 5301430008.

It is an arithmetic number, because the mean of its divisors is an integer number (21205720008).

Almost surely, 2^74220020021 is an apocalyptic number.

It is an amenable number.

74220020021 is a deficient number, since it is larger than the sum of its proper divisors (10602860011).

74220020021 is a wasteful number, since it uses less digits than its factorization.

74220020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10602860010.

The product of its (nonzero) digits is 448, while the sum is 20.

Adding to 74220020021 its reverse (12002002247), we get a palindrome (86222022268).

The spelling of 74220020021 in words is "seventy-four billion, two hundred twenty million, twenty thousand, twenty-one".