33242637721 has 4 divisors (see below), whose sum is σ = 33274633600. Its totient is φ = 33210641844.

The previous prime is 33242637719. The next prime is 33242637761. The reversal of 33242637721 is 12773624233.

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 a cyclic number.

It is not a de Polignac number, because 33242637721 - 2¹ = 33242637719 is a prime.

It is a super-2 number, since 2×33242637721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33242637761) 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, 15996381 + ... + 15998458.

It is an arithmetic number, because the mean of its divisors is an integer number (8318658400).

Almost surely, 2^33242637721 is an apocalyptic number.

It is an amenable number.

33242637721 is a deficient number, since it is larger than the sum of its proper divisors (31995879).

33242637721 is a wasteful number, since it uses less digits than its factorization.

33242637721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31995878.

The product of its digits is 254016, while the sum is 40.

The spelling of 33242637721 in words is "thirty-three billion, two hundred forty-two million, six hundred thirty-seven thousand, seven hundred twenty-one".