412131721 has 2 divisors, whose sum is σ = 412131722. Its totient is φ = 412131720.

The previous prime is 412131719. The next prime is 412131739. The reversal of 412131721 is 127131214.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409455225 + 2676496 = 20235^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 412131721 - 2¹ = 412131719 is a prime.

Together with 412131719, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 412131692 and 412131701.

It is not a weakly prime, because it can be changed into another prime (412131761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206065860 + 206065861.

It is an arithmetic number, because the mean of its divisors is an integer number (206065861).

Almost surely, 2^412131721 is an apocalyptic number.

It is an amenable number.

412131721 is a deficient number, since it is larger than the sum of its proper divisors (1).

412131721 is an equidigital number, since it uses as much as digits as its factorization.

412131721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 412131721 is about 20301.0275848293. The cubic root of 412131721 is about 744.1811768512.

Adding to 412131721 its reverse (127131214), we get a palindrome (539262935).

The spelling of 412131721 in words is "four hundred twelve million, one hundred thirty-one thousand, seven hundred twenty-one".