21969350 has 48 divisors (see below), whose sum is σ = 44705472. Its totient is φ = 7983360.

The previous prime is 21969331. The next prime is 21969371. The reversal of 21969350 is 5396912.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21969350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47219 + ... + 47681.

It is an arithmetic number, because the mean of its divisors is an integer number (931364).

Almost surely, 2^21969350 is an apocalyptic number.

21969350 is an abundant number, since it is smaller than the sum of its proper divisors (22736122).

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

21969350 is a wasteful number, since it uses less digits than its factorization.

21969350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21969350 is about 4687.1473200658. The cubic root of 21969350 is about 280.0737475811.

The spelling of 21969350 in words is "twenty-one million, nine hundred sixty-nine thousand, three hundred fifty".