221211133400 has 24 divisors (see below), whose sum is σ = 514315885620. Its totient is φ = 88484453280.

The previous prime is 221211133399. The next prime is 221211133499. The reversal of 221211133400 is 4331112122.

It is a super-2 number, since 2×221211133400² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 553027634 + ... + 553028033.

Almost surely, 2^221211133400 is an apocalyptic number.

221211133400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211133400 is an abundant number, since it is smaller than the sum of its proper divisors (293104752220).

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

221211133400 is a wasteful number, since it uses less digits than its factorization.

221211133400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106055683 (or 1106055674 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221211133400 its reverse (4331112122), we get a palindrome (225542245522).

The spelling of 221211133400 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thirty-three thousand, four hundred".