213215253444 has 72 divisors (see below), whose sum is σ = 572358274488. Its totient is φ = 66692505600.

The previous prime is 213215253439. The next prime is 213215253457. The reversal of 213215253444 is 444352512312.

It is a happy number.

213215253444 is a `hidden beast` number, since 2 + 1 + 32 + 1 + 52 + 534 + 44 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 54363585600 + 158851667844 = 233160^2 + 398562^2 .

It is a super-3 number, since 3×213215253444³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 213215253399 and 213215253408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310657 + ... + 723144.

It is an arithmetic number, because the mean of its divisors is an integer number (7949420479).

Almost surely, 2^213215253444 is an apocalyptic number.

It is an amenable number.

213215253444 is an abundant number, since it is smaller than the sum of its proper divisors (359143021044).

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

213215253444 is a wasteful number, since it uses less digits than its factorization.

213215253444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034165 (or 1034160 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 213215253444 its reverse (444352512312), we get a palindrome (657567765756).

The spelling of 213215253444 in words is "two hundred thirteen billion, two hundred fifteen million, two hundred fifty-three thousand, four hundred forty-four".