21801932 has 6 divisors (see below), whose sum is σ = 38153388. Its totient is φ = 10900964.

The previous prime is 21801931. The next prime is 21801943. The reversal of 21801932 is 23910812.

It is not an unprimeable number, because it can be changed into a prime (21801931) 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 as a sum of consecutive naturals, namely, 2725238 + ... + 2725245.

It is an arithmetic number, because the mean of its divisors is an integer number (6358898).

Almost surely, 2^21801932 is an apocalyptic number.

It is an amenable number.

21801932 is a deficient number, since it is larger than the sum of its proper divisors (16351456).

21801932 is a wasteful number, since it uses less digits than its factorization.

21801932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450487 (or 5450485 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21801932 is about 4669.2539018563. The cubic root of 21801932 is about 279.3604963051.

The spelling of 21801932 in words is "twenty-one million, eight hundred one thousand, nine hundred thirty-two".