31200120221 has 8 divisors (see below), whose sum is σ = 32241957888. Its totient is φ = 30160494000.

The previous prime is 31200120197. The next prime is 31200120227. The reversal of 31200120221 is 12202100213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200120221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31200120196 and 31200120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200120227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524150 + ... + 580631.

It is an arithmetic number, because the mean of its divisors is an integer number (4030244736).

Almost surely, 2^31200120221 is an apocalyptic number.

31200120221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31200120221 is a deficient number, since it is larger than the sum of its proper divisors (1041837667).

31200120221 is a wasteful number, since it uses less digits than its factorization.

31200120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105723.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31200120221 its reverse (12202100213), we get a palindrome (43402220434).

The spelling of 31200120221 in words is "thirty-one billion, two hundred million, one hundred twenty thousand, two hundred twenty-one".