21492948 has 48 divisors (see below), whose sum is σ = 53577216. Its totient is φ = 6689760.

The previous prime is 21492941. The next prime is 21492949. The reversal of 21492948 is 84929412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10963 + ... + 12773.

It is an arithmetic number, because the mean of its divisors is an integer number (1116192).

Almost surely, 2^21492948 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21492948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26788608).

21492948 is an abundant number, since it is smaller than the sum of its proper divisors (32084268).

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

21492948 is a wasteful number, since it uses less digits than its factorization.

21492948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884 (or 1882 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 21492948 is about 4636.0487486652. The cubic root of 21492948 is about 278.0344832404.

The spelling of 21492948 in words is "twenty-one million, four hundred ninety-two thousand, nine hundred forty-eight".