21839010 has 32 divisors (see below), whose sum is σ = 52823232. Its totient is φ = 5778240.

The previous prime is 21839009. The next prime is 21839011. The reversal of 21839010 is 1093812.

It is an interprime number because it is at equal distance from previous prime (21839009) and next prime (21839011).

It is not an unprimeable number, because it can be changed into a prime (21839011) 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, 1152 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (1650726).

Almost surely, 2^21839010 is an apocalyptic number.

21839010 is an abundant number, since it is smaller than the sum of its proper divisors (30984222).

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

21839010 is a wasteful number, since it uses less digits than its factorization.

21839010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21839010 is about 4673.2226567969. Note that the first 3 decimals coincide. The cubic root of 21839010 is about 279.5187737471.

The spelling of 21839010 in words is "twenty-one million, eight hundred thirty-nine thousand, ten".