213021223440 has 80 divisors (see below), whose sum is σ = 660420105408. Its totient is φ = 56800987648.

The previous prime is 213021223421. The next prime is 213021223469. The reversal of 213021223440 is 44322120312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 213021223440.

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, 3670327 + ... + 3727913.

Almost surely, 2^213021223440 is an apocalyptic number.

213021223440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213021223440 is an abundant number, since it is smaller than the sum of its proper divisors (447398881968).

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

213021223440 is a wasteful number, since it uses less digits than its factorization.

213021223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73016 (or 73010 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 213021223440 its reverse (44322120312), we get a palindrome (257343343752).

The spelling of 213021223440 in words is "two hundred thirteen billion, twenty-one million, two hundred twenty-three thousand, four hundred forty".