21822878 has 16 divisors (see below), whose sum is σ = 40811904. Its totient is φ = 8502360.

The previous prime is 21822869. The next prime is 21822901. The reversal of 21822878 is 87822812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70700 + ... + 71007.

It is an arithmetic number, because the mean of its divisors is an integer number (2550744).

Almost surely, 2^21822878 is an apocalyptic number.

21822878 is a deficient number, since it is larger than the sum of its proper divisors (18989026).

21822878 is a wasteful number, since it uses less digits than its factorization.

21822878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141727.

The product of its digits is 28672, while the sum is 38.

The square root of 21822878 is about 4671.4963341525. The cubic root of 21822878 is about 279.4499319881.

The spelling of 21822878 in words is "twenty-one million, eight hundred twenty-two thousand, eight hundred seventy-eight".