213633381 has 8 divisors (see below), whose sum is σ = 306755680. Its totient is φ = 131466672.

The previous prime is 213633347. The next prime is 213633403. The reversal of 213633381 is 183336312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213633381 - 2⁶ = 213633317 is a prime.

It is a super-2 number, since 2×213633381² = 91278442954982322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213633181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2738851 + ... + 2738928.

It is an arithmetic number, because the mean of its divisors is an integer number (38344460).

Almost surely, 2^213633381 is an apocalyptic number.

It is an amenable number.

213633381 is a deficient number, since it is larger than the sum of its proper divisors (93122299).

213633381 is a wasteful number, since it uses less digits than its factorization.

213633381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5477795.

The product of its digits is 7776, while the sum is 30.

The square root of 213633381 is about 14616.2026874288. The cubic root of 213633381 is about 597.8006339434.

Adding to 213633381 its reverse (183336312), we get a palindrome (396969693).

The spelling of 213633381 in words is "two hundred thirteen million, six hundred thirty-three thousand, three hundred eighty-one".