21221883 has 12 divisors (see below), whose sum is σ = 30695808. Its totient is φ = 14128560.

The previous prime is 21221867. The next prime is 21221897. The reversal of 21221883 is 38812212.

It is not a de Polignac number, because 21221883 - 2⁴ = 21221867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8998 + ... + 11108.

It is an arithmetic number, because the mean of its divisors is an integer number (2557984).

Almost surely, 2^21221883 is an apocalyptic number.

21221883 is a deficient number, since it is larger than the sum of its proper divisors (9473925).

21221883 is a wasteful number, since it uses less digits than its factorization.

21221883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234 (or 3231 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21221883 is about 4606.7215023268. The cubic root of 21221883 is about 276.8606953325.

It can be divided in two parts, 2122 and 1883, that added together give a triangular number (4005 = T₈₉).

The spelling of 21221883 in words is "twenty-one million, two hundred twenty-one thousand, eight hundred eighty-three".