21450342 has 8 divisors (see below), whose sum is σ = 42900696. Its totient is φ = 7150112.

The previous prime is 21450337. The next prime is 21450347. The reversal of 21450342 is 24305412.

It is an interprime number because it is at equal distance from previous prime (21450337) and next prime (21450347).

It is a sphenic number, since it is the product of 3 distinct primes.

21450342 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450347) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1787523 + ... + 1787534.

It is an arithmetic number, because the mean of its divisors is an integer number (5362587).

Almost surely, 2^21450342 is an apocalyptic number.

21450342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21450342 is a wasteful number, since it uses less digits than its factorization.

21450342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575062.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21450342 is about 4631.4513923823. The cubic root of 21450342 is about 277.8506435096.

Adding to 21450342 its reverse (24305412), we get a palindrome (45755754).

The spelling of 21450342 in words is "twenty-one million, four hundred fifty thousand, three hundred forty-two".