21365350 has 12 divisors (see below), whose sum is σ = 39739644. Its totient is φ = 8546120.

The previous prime is 21365347. The next prime is 21365353. The reversal of 21365350 is 5356312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21365347) and next prime (21365353).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213604 + ... + 213703.

It is an arithmetic number, because the mean of its divisors is an integer number (3311637).

Almost surely, 2^21365350 is an apocalyptic number.

21365350 is a deficient number, since it is larger than the sum of its proper divisors (18374294).

21365350 is a wasteful number, since it uses less digits than its factorization.

21365350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427319 (or 427314 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 21365350 is about 4622.2667599350. The cubic root of 21365350 is about 277.4831848697.

The spelling of 21365350 in words is "twenty-one million, three hundred sixty-five thousand, three hundred fifty".