213041421 has 20 divisors (see below), whose sum is σ = 321410364. Its totient is φ = 140616000.

The previous prime is 213041419. The next prime is 213041429. The reversal of 213041421 is 124140312.

It can be written as a sum of positive squares in 2 ways, for example, as 201952521 + 11088900 = 14211^2 + 3330^2 .

It is not a de Polignac number, because 213041421 - 2¹ = 213041419 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 213041394 and 213041403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213041429) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4840 + ... + 21201.

Almost surely, 2^213041421 is an apocalyptic number.

It is an amenable number.

213041421 is a deficient number, since it is larger than the sum of its proper divisors (108368943).

213041421 is a wasteful number, since it uses less digits than its factorization.

213041421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26154 (or 26145 counting only the distinct ones).

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

The square root of 213041421 is about 14595.9385104213. The cubic root of 213041421 is about 597.2479715312.

Adding to 213041421 its reverse (124140312), we get a palindrome (337181733).

The spelling of 213041421 in words is "two hundred thirteen million, forty-one thousand, four hundred twenty-one".