21583042 has 8 divisors (see below), whose sum is σ = 34864956. Its totient is φ = 9961392.

The previous prime is 21583027. The next prime is 21583043. The reversal of 21583042 is 24038512.

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 707281 = 4569^2 + 841^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21582998 and 21583016.

It is not an unprimeable number, because it can be changed into a prime (21583043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415033 + ... + 415084.

Almost surely, 2^21583042 is an apocalyptic number.

21583042 is a deficient number, since it is larger than the sum of its proper divisors (13281914).

21583042 is a wasteful number, since it uses less digits than its factorization.

21583042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830132.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21583042 is about 4645.7552669076. The cubic root of 21583042 is about 278.4224293953.

The spelling of 21583042 in words is "twenty-one million, five hundred eighty-three thousand, forty-two".