21301023 has 8 divisors (see below), whose sum is σ = 28505008. Its totient is φ = 14148864.

The previous prime is 21300997. The next prime is 21301031. The reversal of 21301023 is 32010312.

It is a happy number.

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

It is not a de Polignac number, because 21301023 - 2⁶ = 21300959 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 11986 + ... + 13647.

It is an arithmetic number, because the mean of its divisors is an integer number (3563126).

Almost surely, 2^21301023 is an apocalyptic number.

21301023 is a deficient number, since it is larger than the sum of its proper divisors (7203985).

21301023 is a wasteful number, since it uses less digits than its factorization.

21301023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25913.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21301023 is about 4615.3031319730. The cubic root of 21301023 is about 277.2044219064.

Adding to 21301023 its reverse (32010312), we get a palindrome (53311335).

The spelling of 21301023 in words is "twenty-one million, three hundred one thousand, twenty-three".