402440200121 has 2 divisors, whose sum is σ = 402440200122. Its totient is φ = 402440200120.

The previous prime is 402440200081. The next prime is 402440200153. The reversal of 402440200121 is 121002044204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331505335225 + 70934864896 = 575765^2 + 266336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402440200121 is a prime.

It is a super-2 number, since 2×402440200121² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402440200093 and 402440200102.

It is not a weakly prime, because it can be changed into another prime (402440200181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201220100060 + 201220100061.

It is an arithmetic number, because the mean of its divisors is an integer number (201220100061).

Almost surely, 2^402440200121 is an apocalyptic number.

It is an amenable number.

402440200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

402440200121 is an equidigital number, since it uses as much as digits as its factorization.

402440200121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 402440200121 its reverse (121002044204), we get a palindrome (523442244325).

The spelling of 402440200121 in words is "four hundred two billion, four hundred forty million, two hundred thousand, one hundred twenty-one".