420121181 has 4 divisors (see below), whose sum is σ = 420164412. Its totient is φ = 420077952.

The previous prime is 420121171. The next prime is 420121249. The reversal of 420121181 is 181121024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 196140025 + 223981156 = 14005^2 + 14966^2 .

It is a cyclic number.

It is not a de Polignac number, because 420121181 - 2¹⁰ = 420120157 is a prime.

It is a super-2 number, since 2×420121181² = 353003613449669522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420121171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515 + ... + 28991.

It is an arithmetic number, because the mean of its divisors is an integer number (105041103).

Almost surely, 2^420121181 is an apocalyptic number.

It is an amenable number.

420121181 is a deficient number, since it is larger than the sum of its proper divisors (43231).

420121181 is a wasteful number, since it uses less digits than its factorization.

420121181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43230.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 420121181 is about 20496.8578323605. The cubic root of 420121181 is about 748.9592563233.

The spelling of 420121181 in words is "four hundred twenty million, one hundred twenty-one thousand, one hundred eighty-one".