21872283 has 8 divisors (see below), whose sum is σ = 29188608. Its totient is φ = 14568744.

The previous prime is 21872281. The next prime is 21872309. The reversal of 21872283 is 38227812.

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

It is not a de Polignac number, because 21872283 - 2¹ = 21872281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21872281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2010 + ... + 6912.

It is an arithmetic number, because the mean of its divisors is an integer number (3648576).

Almost surely, 2^21872283 is an apocalyptic number.

21872283 is a deficient number, since it is larger than the sum of its proper divisors (7316325).

21872283 is a wasteful number, since it uses less digits than its factorization.

21872283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393.

The product of its digits is 10752, while the sum is 33.

The square root of 21872283 is about 4676.7812649300. The cubic root of 21872283 is about 279.6606560777.

It can be divided in two parts, 21872 and 283, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21872283 in words is "twenty-one million, eight hundred seventy-two thousand, two hundred eighty-three".