21848742 has 24 divisors (see below), whose sum is σ = 47427744. Its totient is φ = 7269264.

The previous prime is 21848741. The next prime is 21848753. The reversal of 21848742 is 24784812.

It is a junction number, because it is equal to n+sod(n) for n = 21848697 and 21848706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14643 + ... + 16065.

It is an arithmetic number, because the mean of its divisors is an integer number (1976156).

Almost surely, 2^21848742 is an apocalyptic number.

21848742 is an abundant number, since it is smaller than the sum of its proper divisors (25579002).

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

21848742 is a wasteful number, since it uses less digits than its factorization.

21848742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284 (or 2281 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 21848742 is about 4674.2637922993. The cubic root of 21848742 is about 279.5602877280.

The spelling of 21848742 in words is "twenty-one million, eight hundred forty-eight thousand, seven hundred forty-two".