21428950 has 12 divisors (see below), whose sum is σ = 39857940. Its totient is φ = 8571560.

The previous prime is 21428947. The next prime is 21428963. The reversal of 21428950 is 5982412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214240 + ... + 214339.

It is an arithmetic number, because the mean of its divisors is an integer number (3321495).

Almost surely, 2^21428950 is an apocalyptic number.

21428950 is a deficient number, since it is larger than the sum of its proper divisors (18428990).

21428950 is a wasteful number, since it uses less digits than its factorization.

21428950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428591 (or 428586 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21428950 is about 4629.1413890699. The cubic root of 21428950 is about 277.7582478121.

The spelling of 21428950 in words is "twenty-one million, four hundred twenty-eight thousand, nine hundred fifty".