400232332421 has 2 divisors, whose sum is σ = 400232332422. Its totient is φ = 400232332420.

The previous prime is 400232332403. The next prime is 400232332481. The reversal of 400232332421 is 124233232004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315501273025 + 84731059396 = 561695^2 + 291086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400232332421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400232332481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200116166210 + 200116166211.

It is an arithmetic number, because the mean of its divisors is an integer number (200116166211).

Almost surely, 2^400232332421 is an apocalyptic number.

It is an amenable number.

400232332421 is a deficient number, since it is larger than the sum of its proper divisors (1).

400232332421 is an equidigital number, since it uses as much as digits as its factorization.

400232332421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 400232332421 its reverse (124233232004), we get a palindrome (524465564425).

The spelling of 400232332421 in words is "four hundred billion, two hundred thirty-two million, three hundred thirty-two thousand, four hundred twenty-one".