400132021 has 2 divisors, whose sum is σ = 400132022. Its totient is φ = 400132020.

The previous prime is 400131959. The next prime is 400132027. The reversal of 400132021 is 120231004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365192100 + 34939921 = 19110^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 400132021 - 2¹¹ = 400129973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400131992 and 400132010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400132027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200066010 + 200066011.

It is an arithmetic number, because the mean of its divisors is an integer number (200066011).

Almost surely, 2^400132021 is an apocalyptic number.

It is an amenable number.

400132021 is a deficient number, since it is larger than the sum of its proper divisors (1).

400132021 is an equidigital number, since it uses as much as digits as its factorization.

400132021 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 13.

The square root of 400132021 is about 20003.3002527083. The cubic root of 400132021 is about 736.8873523986.

Adding to 400132021 its reverse (120231004), we get a palindrome (520363025).

The spelling of 400132021 in words is "four hundred million, one hundred thirty-two thousand, twenty-one".