21882042 has 128 divisors (see below), whose sum is σ = 61662720. Its totient is φ = 5598720.

The previous prime is 21882031. The next prime is 21882061. The reversal of 21882042 is 24028812.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21881997 and 21882015.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 299718 + ... + 299790.

It is an arithmetic number, because the mean of its divisors is an integer number (481740).

Almost surely, 2^21882042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21882042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30831360).

21882042 is an abundant number, since it is smaller than the sum of its proper divisors (39780678).

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

21882042 is a wasteful number, since it uses less digits than its factorization.

21882042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21882042 is about 4677.8244943563. The cubic root of 21882042 is about 279.7022429959.

The spelling of 21882042 in words is "twenty-one million, eight hundred eighty-two thousand, forty-two".