213044121 has 64 divisors (see below), whose sum is σ = 344678400. Its totient is φ = 129729600.

The previous prime is 213044053. The next prime is 213044123. The reversal of 213044121 is 121440312.

It is not a de Polignac number, because 213044121 - 2⁷ = 213043993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213044094 and 213044103.

It is not an unprimeable number, because it can be changed into a prime (213044123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1626226 + ... + 1626356.

It is an arithmetic number, because the mean of its divisors is an integer number (5385600).

Almost surely, 2^213044121 is an apocalyptic number.

It is an amenable number.

213044121 is a deficient number, since it is larger than the sum of its proper divisors (131634279).

213044121 is a wasteful number, since it uses less digits than its factorization.

213044121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 213044121 is about 14596.0310016114. The cubic root of 213044121 is about 597.2504946129.

Adding to 213044121 its reverse (121440312), we get a palindrome (334484433).

It can be divided in two parts, 21304 and 4121, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 213044121 in words is "two hundred thirteen million, forty-four thousand, one hundred twenty-one".