21271983 has 8 divisors (see below), whose sum is σ = 29277696. Its totient is φ = 13723800.

The previous prime is 21271973. The next prime is 21272011. The reversal of 21271983 is 38917212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21271983 - 2⁵ = 21271951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271903) 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, 114273 + ... + 114458.

It is an arithmetic number, because the mean of its divisors is an integer number (3659712).

Almost surely, 2^21271983 is an apocalyptic number.

21271983 is a deficient number, since it is larger than the sum of its proper divisors (8005713).

21271983 is a wasteful number, since it uses less digits than its factorization.

21271983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228765.

The product of its digits is 6048, while the sum is 33.

The square root of 21271983 is about 4612.1560034327. The cubic root of 21271983 is about 277.0783923190.

The spelling of 21271983 in words is "twenty-one million, two hundred seventy-one thousand, nine hundred eighty-three".