221144011400 has 48 divisors (see below), whose sum is σ = 553710588900. Its totient is φ = 81653172480.

The previous prime is 221144011343. The next prime is 221144011409. The reversal of 221144011400 is 4110441122.

It can be written as a sum of positive squares in 6 ways, for example, as 5329876036 + 215814135364 = 73006^2 + 464558^2 .

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 (221144011409) 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, 42525095 + ... + 42530294.

Almost surely, 2^221144011400 is an apocalyptic number.

221144011400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221144011400 is an abundant number, since it is smaller than the sum of its proper divisors (332566577500).

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

221144011400 is a wasteful number, since it uses less digits than its factorization.

221144011400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85055418 (or 85055409 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221144011400 its reverse (4110441122), we get a palindrome (225254452522).

The spelling of 221144011400 in words is "two hundred twenty-one billion, one hundred forty-four million, eleven thousand, four hundred".