221211430400 has 60 divisors (see below), whose sum is σ = 548068632672. Its totient is φ = 88484567040.

The previous prime is 221211430361. The next prime is 221211430409. The reversal of 221211430400 is 4034112122.

It is a super-2 number, since 2×221211430400² (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 not an unprimeable number, because it can be changed into a prime (221211430409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8628272 + ... + 8653871.

Almost surely, 2^221211430400 is an apocalyptic number.

221211430400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211430400 is an abundant number, since it is smaller than the sum of its proper divisors (326857202272).

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

221211430400 is an equidigital number, since it uses as much as digits as its factorization.

221211430400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17282171 (or 17282150 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221211430400 its reverse (4034112122), we get a palindrome (225245542522).

The spelling of 221211430400 in words is "two hundred twenty-one billion, two hundred eleven million, four hundred thirty thousand, four hundred".