21144030404 has 12 divisors (see below), whose sum is σ = 42288060864. Its totient is φ = 9061727304.

The previous prime is 21144030379. The next prime is 21144030437. The reversal of 21144030404 is 40403044112.

It is a happy number.

21144030404 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21144030404.

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, 377571944 + ... + 377571999.

It is an arithmetic number, because the mean of its divisors is an integer number (3524005072).

Almost surely, 2^21144030404 is an apocalyptic number.

It is an amenable number.

21144030404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21144030404 is a wasteful number, since it uses less digits than its factorization.

21144030404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755143954 (or 755143952 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21144030404 its reverse (40403044112), we get a palindrome (61547074516).

The spelling of 21144030404 in words is "twenty-one billion, one hundred forty-four million, thirty thousand, four hundred four".