21301042 has 16 divisors (see below), whose sum is σ = 37062720. Its totient is φ = 8992368.

The previous prime is 21301031. The next prime is 21301043. The reversal of 21301042 is 24010312.

It is not an unprimeable number, because it can be changed into a prime (21301043) 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, 10417 + ... + 12292.

It is an arithmetic number, because the mean of its divisors is an integer number (2316420).

Almost surely, 2^21301042 is an apocalyptic number.

21301042 is a deficient number, since it is larger than the sum of its proper divisors (15761678).

21301042 is a wasteful number, since it uses less digits than its factorization.

21301042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22785.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21301042 is about 4615.3051903422. The cubic root of 21301042 is about 277.2045043263.

Adding to 21301042 its reverse (24010312), we get a palindrome (45311354).

The spelling of 21301042 in words is "twenty-one million, three hundred one thousand, forty-two".