213155442 has 64 divisors (see below), whose sum is σ = 492011520. Its totient is φ = 68331600.

The previous prime is 213155441. The next prime is 213155461. The reversal of 213155442 is 244551312.

213155442 is a `hidden beast` number, since 213 + 1 + 5 + 5 + 442 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (213155441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373017 + ... + 373587.

It is an arithmetic number, because the mean of its divisors is an integer number (7687680).

Almost surely, 2^213155442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213155442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246005760).

213155442 is an abundant number, since it is smaller than the sum of its proper divisors (278856078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213155442 is a wasteful number, since it uses less digits than its factorization.

213155442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 830 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 213155442 is about 14599.8439032751. The cubic root of 213155442 is about 597.3545027170.

The spelling of 213155442 in words is "two hundred thirteen million, one hundred fifty-five thousand, four hundred forty-two".