213405442 has 8 divisors (see below), whose sum is σ = 320231232. Its totient is φ = 106661700.

The previous prime is 213405421. The next prime is 213405463. The reversal of 213405442 is 244504312.

It is a happy number.

213405442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (213405421) and next prime (213405463).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13534 + ... + 24697.

It is an arithmetic number, because the mean of its divisors is an integer number (40028904).

Almost surely, 2^213405442 is an apocalyptic number.

213405442 is a deficient number, since it is larger than the sum of its proper divisors (106825790).

213405442 is a wasteful number, since it uses less digits than its factorization.

213405442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41024.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 213405442 is about 14608.4031297059. The cubic root of 213405442 is about 597.5879478157.

Adding to 213405442 its reverse (244504312), we get a palindrome (457909754).

The spelling of 213405442 in words is "two hundred thirteen million, four hundred five thousand, four hundred forty-two".