31201000421 has 2 divisors, whose sum is σ = 31201000422. Its totient is φ = 31201000420.

The previous prime is 31201000417. The next prime is 31201000429. The reversal of 31201000421 is 12400010213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19297099396 + 11903901025 = 138914^2 + 109105^2 .

It is an emirp because it is prime and its reverse (12400010213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31201000421 - 2² = 31201000417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31201000396 and 31201000405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31201000429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600500210 + 15600500211.

It is an arithmetic number, because the mean of its divisors is an integer number (15600500211).

Almost surely, 2^31201000421 is an apocalyptic number.

It is an amenable number.

31201000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201000421 is an equidigital number, since it uses as much as digits as its factorization.

31201000421 is an evil number, because the sum of its binary digits is even.

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

Adding to 31201000421 its reverse (12400010213), we get a palindrome (43601010634).

The spelling of 31201000421 in words is "thirty-one billion, two hundred one million, four hundred twenty-one", and thus it is an aban number.