400102121 has 2 divisors, whose sum is σ = 400102122. Its totient is φ = 400102120.

The previous prime is 400102103. The next prime is 400102139. The reversal of 400102121 is 121201004.

It is a balanced prime because it is at equal distance from previous prime (400102103) and next prime (400102139).

It can be written as a sum of positive squares in only one way, i.e., 254562025 + 145540096 = 15955^2 + 12064^2 .

It is a cyclic number.

It is not a de Polignac number, because 400102121 - 2¹⁴ = 400085737 is a prime.

It is not a weakly prime, because it can be changed into another prime (400102321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200051060 + 200051061.

It is an arithmetic number, because the mean of its divisors is an integer number (200051061).

Almost surely, 2^400102121 is an apocalyptic number.

It is an amenable number.

400102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

400102121 is an equidigital number, since it uses as much as digits as its factorization.

400102121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 400102121 is about 20002.5528620724. The cubic root of 400102121 is about 736.8689972229.

Adding to 400102121 its reverse (121201004), we get a palindrome (521303125).

The spelling of 400102121 in words is "four hundred million, one hundred two thousand, one hundred twenty-one".