402050221 has 4 divisors (see below), whose sum is σ = 425700252. Its totient is φ = 378400192.

The previous prime is 402050179. The next prime is 402050227. The reversal of 402050221 is 122050204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 358344900 + 43705321 = 18930^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 402050221 - 2⁷ = 402050093 is a prime.

It is a super-2 number, since 2×402050221² = 323288760412297682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402050195 and 402050204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402050227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11824990 + ... + 11825023.

It is an arithmetic number, because the mean of its divisors is an integer number (106425063).

Almost surely, 2^402050221 is an apocalyptic number.

It is an amenable number.

402050221 is a deficient number, since it is larger than the sum of its proper divisors (23650031).

402050221 is a wasteful number, since it uses less digits than its factorization.

402050221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23650030.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 402050221 is about 20051.1900145602. The cubic root of 402050221 is about 738.0630015276.

The spelling of 402050221 in words is "four hundred two million, fifty thousand, two hundred twenty-one".