21144144412 has 12 divisors (see below), whose sum is σ = 38278192680. Its totient is φ = 10207517936.

The previous prime is 21144144397. The next prime is 21144144479. The reversal of 21144144412 is 21444144112.

It is a super-3 number, since 3×21144144412³ (a number of 32 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91138438 + ... + 91138669.

It is an arithmetic number, because the mean of its divisors is an integer number (3189849390).

Almost surely, 2^21144144412 is an apocalyptic number.

It is an amenable number.

21144144412 is a deficient number, since it is larger than the sum of its proper divisors (17134048268).

21144144412 is a wasteful number, since it uses less digits than its factorization.

21144144412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182277140 (or 182277138 counting only the distinct ones).

The product of its digits is 4096, while the sum is 28.

Adding to 21144144412 its reverse (21444144112), we get a palindrome (42588288524).

The spelling of 21144144412 in words is "twenty-one billion, one hundred forty-four million, one hundred forty-four thousand, four hundred twelve".