213440021244 has 48 divisors (see below), whose sum is σ = 553906348800. Its totient is φ = 71076817008.

The previous prime is 213440021233. The next prime is 213440021309. The reversal of 213440021244 is 442120044312.

213440021244 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 400 + 212 + 44 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859672 + ... + 1079775.

It is an arithmetic number, because the mean of its divisors is an integer number (11539715600).

Almost surely, 2^213440021244 is an apocalyptic number.

It is an amenable number.

213440021244 is an abundant number, since it is smaller than the sum of its proper divisors (340466327556).

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

213440021244 is a wasteful number, since it uses less digits than its factorization.

213440021244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940479 (or 1940471 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 213440021244 its reverse (442120044312), we get a palindrome (655560065556).

The spelling of 213440021244 in words is "two hundred thirteen billion, four hundred forty million, twenty-one thousand, two hundred forty-four".