21350051224 has 16 divisors (see below), whose sum is σ = 40481137800. Its totient is φ = 10555081152.

The previous prime is 21350051213. The next prime is 21350051251. The reversal of 21350051224 is 42215005312.

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, 14992302 + ... + 14993725.

Almost surely, 2^21350051224 is an apocalyptic number.

It is an amenable number.

21350051224 is a deficient number, since it is larger than the sum of its proper divisors (19131086576).

21350051224 is a wasteful number, since it uses less digits than its factorization.

21350051224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29986122 (or 29986118 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21350051224 its reverse (42215005312), we get a palindrome (63565056536).

The spelling of 21350051224 in words is "twenty-one billion, three hundred fifty million, fifty-one thousand, two hundred twenty-four".