21401111224 has 16 divisors (see below), whose sum is σ = 40980852000. Its totient is φ = 10472884032.

The previous prime is 21401111219. The next prime is 21401111287. The reversal of 21401111224 is 42211110412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28458549 + ... + 28459300.

It is an arithmetic number, because the mean of its divisors is an integer number (2561303250).

Almost surely, 2^21401111224 is an apocalyptic number.

It is an amenable number.

21401111224 is a deficient number, since it is larger than the sum of its proper divisors (19579740776).

21401111224 is a wasteful number, since it uses less digits than its factorization.

21401111224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56917902 (or 56917898 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21401111224 its reverse (42211110412), we get a palindrome (63612221636).

The spelling of 21401111224 in words is "twenty-one billion, four hundred one million, one hundred eleven thousand, two hundred twenty-four".