213921394 has 4 divisors (see below), whose sum is σ = 320882094. Its totient is φ = 106960696.

The previous prime is 213921391. The next prime is 213921397. The reversal of 213921394 is 493129312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (213921391) and next prime (213921397).

It can be written as a sum of positive squares in only one way, i.e., 210627169 + 3294225 = 14513^2 + 1815^2 .

It is not an unprimeable number, because it can be changed into a prime (213921391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53480347 + ... + 53480350.

Almost surely, 2^213921394 is an apocalyptic number.

213921394 is a deficient number, since it is larger than the sum of its proper divisors (106960700).

213921394 is a wasteful number, since it uses less digits than its factorization.

213921394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106960699.

The product of its digits is 11664, while the sum is 34.

The square root of 213921394 is about 14626.0518937955. The cubic root of 213921394 is about 598.0691578947.

The spelling of 213921394 in words is "two hundred thirteen million, nine hundred twenty-one thousand, three hundred ninety-four".