212401409 has 4 divisors (see below), whose sum is σ = 231710640. Its totient is φ = 193092180.

The previous prime is 212401363. The next prime is 212401411. The reversal of 212401409 is 904104212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212401409 - 2¹⁶ = 212335873 is a prime.

It is a super-2 number, since 2×212401409² = 90228717090370562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212401439) 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, 9654599 + ... + 9654620.

It is an arithmetic number, because the mean of its divisors is an integer number (57927660).

Almost surely, 2^212401409 is an apocalyptic number.

It is an amenable number.

212401409 is a deficient number, since it is larger than the sum of its proper divisors (19309231).

212401409 is a wasteful number, since it uses less digits than its factorization.

212401409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19309230.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 212401409 is about 14573.9977013858. The cubic root of 212401409 is about 596.6492940786.

The spelling of 212401409 in words is "two hundred twelve million, four hundred one thousand, four hundred nine".