21807342 has 48 divisors (see below), whose sum is σ = 48859200. Its totient is φ = 7025856.

The previous prime is 21807341. The next prime is 21807343. The reversal of 21807342 is 24370812.

It is an interprime number because it is at equal distance from previous prime (21807341) and next prime (21807343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21807341) 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, 125968 + ... + 126140.

It is an arithmetic number, because the mean of its divisors is an integer number (1017900).

Almost surely, 2^21807342 is an apocalyptic number.

21807342 is an abundant number, since it is smaller than the sum of its proper divisors (27051858).

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

21807342 is a wasteful number, since it uses less digits than its factorization.

21807342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21807342 is about 4669.8331875989. The cubic root of 21807342 is about 279.3836015249.

The spelling of 21807342 in words is "twenty-one million, eight hundred seven thousand, three hundred forty-two".