401350021 has 2 divisors, whose sum is σ = 401350022. Its totient is φ = 401350020.

The previous prime is 401349979. The next prime is 401350067. The reversal of 401350021 is 120053104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249197796 + 152152225 = 15786^2 + 12335^2 .

It is a cyclic number.

It is not a de Polignac number, because 401350021 - 2¹⁵ = 401317253 is a prime.

It is a super-2 number, since 2×401350021² = 322163678713400882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401349977 and 401350004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401350121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200675010 + 200675011.

It is an arithmetic number, because the mean of its divisors is an integer number (200675011).

Almost surely, 2^401350021 is an apocalyptic number.

It is an amenable number.

401350021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401350021 is an equidigital number, since it uses as much as digits as its factorization.

401350021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 401350021 is about 20033.7220955069. The cubic root of 401350021 is about 737.6342889045.

The spelling of 401350021 in words is "four hundred one million, three hundred fifty thousand, twenty-one".