21340338 has 48 divisors (see below), whose sum is σ = 46919424. Its totient is φ = 6462720.

The previous prime is 21340337. The next prime is 21340339. The reversal of 21340338 is 83304312.

It is an interprime number because it is at equal distance from previous prime (21340337) and next prime (21340339).

It is not an unprimeable number, because it can be changed into a prime (21340337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53556 + ... + 53952.

It is an arithmetic number, because the mean of its divisors is an integer number (977488).

Almost surely, 2^21340338 is an apocalyptic number.

21340338 is an abundant number, since it is smaller than the sum of its proper divisors (25579086).

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

21340338 is a wasteful number, since it uses less digits than its factorization.

21340338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21340338 is about 4619.5603686931. The cubic root of 21340338 is about 277.3748611974.

The spelling of 21340338 in words is "twenty-one million, three hundred forty thousand, three hundred thirty-eight".