213040044 has 192 divisors, whose sum is σ = 661248000. Its totient is φ = 60011280.

The previous prime is 213040031. The next prime is 213040057. The reversal of 213040044 is 440040312.

It is an interprime number because it is at equal distance from previous prime (213040031) and next prime (213040057).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 213039999 and 213040026.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3000529 + ... + 3000599.

It is an arithmetic number, because the mean of its divisors is an integer number (3444000).

Almost surely, 2^213040044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213040044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330624000).

213040044 is an abundant number, since it is smaller than the sum of its proper divisors (448207956).

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

213040044 is an frugal number, since it uses more digits than its factorization.

213040044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 213040044 is about 14595.8913396887. The cubic root of 213040044 is about 597.2466847513.

Adding to 213040044 its reverse (440040312), we get a palindrome (653080356).

The spelling of 213040044 in words is "two hundred thirteen million, forty thousand, forty-four".