31200042022421 has 2 divisors, whose sum is σ = 31200042022422. Its totient is φ = 31200042022420.

The previous prime is 31200042022411. The next prime is 31200042022441. The reversal of 31200042022421 is 12422024000213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21118712160100 + 10081329862321 = 4595510^2 + 3175111^2 .

It is an emirp because it is prime and its reverse (12422024000213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200042022421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31200042022411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600021011210 + 15600021011211.

It is an arithmetic number, because the mean of its divisors is an integer number (15600021011211).

Almost surely, 2^{31200042022421} is an apocalyptic number.

It is an amenable number.

31200042022421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200042022421 is an equidigital number, since it uses as much as digits as its factorization.

31200042022421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 31200042022421 its reverse (12422024000213), we get a palindrome (43622066022634).

The spelling of 31200042022421 in words is "thirty-one trillion, two hundred billion, forty-two million, twenty-two thousand, four hundred twenty-one".