21110200144 has 60 divisors (see below), whose sum is σ = 46507687380. Its totient is φ = 9264640000.

The previous prime is 21110200129. The next prime is 21110200159. The reversal of 21110200144 is 44100201112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21110200129) and next prime (21110200159).

It can be written as a sum of positive squares in 2 ways, for example, as 12119367744 + 8990832400 = 110088^2 + 94820^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131857 + ... + 244144.

It is an arithmetic number, because the mean of its divisors is an integer number (775128123).

Almost surely, 2^21110200144 is an apocalyptic number.

It is an amenable number.

21110200144 is an abundant number, since it is smaller than the sum of its proper divisors (25397487236).

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

21110200144 is a wasteful number, since it uses less digits than its factorization.

21110200144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376060 (or 376043 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21110200144 its reverse (44100201112), we get a palindrome (65210401256).

The spelling of 21110200144 in words is "twenty-one billion, one hundred ten million, two hundred thousand, one hundred forty-four".