21224292 has 24 divisors (see below), whose sum is σ = 52130400. Its totient is φ = 6702336.

The previous prime is 21224267. The next prime is 21224293. The reversal of 21224292 is 29242212.

It is not an unprimeable number, because it can be changed into a prime (21224293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46317 + ... + 46772.

It is an arithmetic number, because the mean of its divisors is an integer number (2172100).

Almost surely, 2^21224292 is an apocalyptic number.

It is an amenable number.

21224292 is an abundant number, since it is smaller than the sum of its proper divisors (30906108).

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

21224292 is a wasteful number, since it uses less digits than its factorization.

21224292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93115 (or 93113 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21224292 is about 4606.9829606804. The cubic root of 21224292 is about 276.8711708745.

The spelling of 21224292 in words is "twenty-one million, two hundred twenty-four thousand, two hundred ninety-two".