21144145104 has 60 divisors (see below), whose sum is σ = 59279571936. Its totient is φ = 7035502656.

The previous prime is 21144145091. The next prime is 21144145133. The reversal of 21144145104 is 40154144112.

It is a happy number.

21144145104 is a `hidden beast` number, since 2 + 1 + 144 + 1 + 4 + 510 + 4 = 666.

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, 49332 + ... + 211475.

Almost surely, 2^21144145104 is an apocalyptic number.

21144145104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21144145104 is an abundant number, since it is smaller than the sum of its proper divisors (38135426832).

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

21144145104 is a wasteful number, since it uses less digits than its factorization.

21144145104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261384 (or 261375 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 21144145104 its reverse (40154144112), we get a palindrome (61298289216).

The spelling of 21144145104 in words is "twenty-one billion, one hundred forty-four million, one hundred forty-five thousand, one hundred four".