221213203400 has 48 divisors (see below), whose sum is σ = 587795087040. Its totient is φ = 75844526400.

The previous prime is 221213203373. The next prime is 221213203403. The reversal of 221213203400 is 4302312122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (221213203403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79003316 + ... + 79006115.

It is an arithmetic number, because the mean of its divisors is an integer number (12245730980).

Almost surely, 2^221213203400 is an apocalyptic number.

221213203400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221213203400 is an abundant number, since it is smaller than the sum of its proper divisors (366581883640).

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

221213203400 is a wasteful number, since it uses less digits than its factorization.

221213203400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158009454 (or 158009445 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 221213203400 its reverse (4302312122), we get a palindrome (225515515522).

The spelling of 221213203400 in words is "two hundred twenty-one billion, two hundred thirteen million, two hundred three thousand, four hundred".