213421534 has 16 divisors (see below), whose sum is σ = 324138528. Its totient is φ = 105380352.

The previous prime is 213421529. The next prime is 213421543. The reversal of 213421534 is 435124312.

It is a junction number, because it is equal to n+sod(n) for n = 213421499 and 213421508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118807 + ... + 120589.

It is an arithmetic number, because the mean of its divisors is an integer number (20258658).

Almost surely, 2^213421534 is an apocalyptic number.

213421534 is a deficient number, since it is larger than the sum of its proper divisors (110716994).

213421534 is a wasteful number, since it uses less digits than its factorization.

213421534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499.

The product of its digits is 2880, while the sum is 25.

The square root of 213421534 is about 14608.9538982091. The cubic root of 213421534 is about 597.6029679631.

Adding to 213421534 its reverse (435124312), we get a palindrome (648545846).

The spelling of 213421534 in words is "two hundred thirteen million, four hundred twenty-one thousand, five hundred thirty-four".