21881202 has 16 divisors (see below), whose sum is σ = 50014272. Its totient is φ = 6251760.

The previous prime is 21881201. The next prime is 21881203. The reversal of 21881202 is 20218812.

It is an interprime number because it is at equal distance from previous prime (21881201) and next prime (21881203).

It is not an unprimeable number, because it can be changed into a prime (21881201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260449 + ... + 260532.

It is an arithmetic number, because the mean of its divisors is an integer number (3125892).

Almost surely, 2^21881202 is an apocalyptic number.

21881202 is an abundant number, since it is smaller than the sum of its proper divisors (28133070).

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

21881202 is a wasteful number, since it uses less digits than its factorization.

21881202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520993.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 21881202 is about 4677.7347081680. The cubic root of 21881202 is about 279.6986639136.

The spelling of 21881202 in words is "twenty-one million, eight hundred eighty-one thousand, two hundred two".