31200230133021 has 4 divisors (see below), whose sum is σ = 41600306844032. Its totient is φ = 20800153422012.

The previous prime is 31200230133001. The next prime is 31200230133043. The reversal of 31200230133021 is 12033103200213.

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 not a de Polignac number, because 31200230133021 - 2⁹ = 31200230132509 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 (31200230133001) 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, 5200038355501 + ... + 5200038355506.

It is an arithmetic number, because the mean of its divisors is an integer number (10400076711008).

Almost surely, 2^{31200230133021} is an apocalyptic number.

It is an amenable number.

31200230133021 is a deficient number, since it is larger than the sum of its proper divisors (10400076711011).

31200230133021 is a wasteful number, since it uses less digits than its factorization.

31200230133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400076711010.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31200230133021 its reverse (12033103200213), we get a palindrome (43233333333234).

The spelling of 31200230133021 in words is "thirty-one trillion, two hundred billion, two hundred thirty million, one hundred thirty-three thousand, twenty-one".