21256350 has 24 divisors (see below), whose sum is σ = 52716120. Its totient is φ = 5668320.

The previous prime is 21256331. The next prime is 21256369. The reversal of 21256350 is 5365212.

It is an interprime number because it is at equal distance from previous prime (21256331) and next prime (21256369).

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21256350.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70705 + ... + 71004.

It is an arithmetic number, because the mean of its divisors is an integer number (2196505).

Almost surely, 2^21256350 is an apocalyptic number.

21256350 is an abundant number, since it is smaller than the sum of its proper divisors (31459770).

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

21256350 is a wasteful number, since it uses less digits than its factorization.

21256350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141724 (or 141719 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21256350 is about 4610.4609314037. The cubic root of 21256350 is about 277.0104997606.

The spelling of 21256350 in words is "twenty-one million, two hundred fifty-six thousand, three hundred fifty".