213051121 has 4 divisors (see below), whose sum is σ = 213262452. Its totient is φ = 212839792.

The previous prime is 213051119. The next prime is 213051169. The reversal of 213051121 is 121150312.

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 1784896 + 211266225 = 1336^2 + 14535^2 .

It is a cyclic number.

It is not a de Polignac number, because 213051121 - 2¹ = 213051119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213051095 and 213051104.

It is not an unprimeable number, because it can be changed into a prime (213051821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104146 + ... + 106171.

It is an arithmetic number, because the mean of its divisors is an integer number (53315613).

Almost surely, 2^213051121 is an apocalyptic number.

It is an amenable number.

213051121 is a deficient number, since it is larger than the sum of its proper divisors (211331).

213051121 is a wasteful number, since it uses less digits than its factorization.

213051121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211330.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 213051121 is about 14596.2707908561. The cubic root of 213051121 is about 597.2570358364.

The spelling of 213051121 in words is "two hundred thirteen million, fifty-one thousand, one hundred twenty-one".