21392950 has 12 divisors (see below), whose sum is σ = 39790980. Its totient is φ = 8557160.

The previous prime is 21392947. The next prime is 21392971. The reversal of 21392950 is 5929312.

It is a zygodrome in base 9.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 213880 + ... + 213979.

It is an arithmetic number, because the mean of its divisors is an integer number (3315915).

Almost surely, 2^21392950 is an apocalyptic number.

21392950 is a deficient number, since it is larger than the sum of its proper divisors (18398030).

21392950 is a wasteful number, since it uses less digits than its factorization.

21392950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427871 (or 427866 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 21392950 is about 4625.2513445217. The cubic root of 21392950 is about 277.6026187579.

The spelling of 21392950 in words is "twenty-one million, three hundred ninety-two thousand, nine hundred fifty".