21841902 has 12 divisors (see below), whose sum is σ = 47324160. Its totient is φ = 7280628.

The previous prime is 21841891. The next prime is 21841909. The reversal of 21841902 is 20914812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606702 + ... + 606737.

It is an arithmetic number, because the mean of its divisors is an integer number (3943680).

Almost surely, 2^21841902 is an apocalyptic number.

21841902 is an abundant number, since it is smaller than the sum of its proper divisors (25482258).

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

21841902 is a wasteful number, since it uses less digits than its factorization.

21841902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213447 (or 1213444 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21841902 is about 4673.5320690031. The cubic root of 21841902 is about 279.5311114953.

The spelling of 21841902 in words is "twenty-one million, eight hundred forty-one thousand, nine hundred two".