21054023 has 8 divisors (see below), whose sum is σ = 21332592. Its totient is φ = 20777536.

The previous prime is 21054017. The next prime is 21054037. The reversal of 21054023 is 32045012.

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

It is a cyclic number.

It is not a de Polignac number, because 21054023 - 2²⁴ = 4276807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21053992 and 21054010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054323) 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, 30761 + ... + 31437.

It is an arithmetic number, because the mean of its divisors is an integer number (2666574).

Almost surely, 2^21054023 is an apocalyptic number.

21054023 is a deficient number, since it is larger than the sum of its proper divisors (278569).

21054023 is a wasteful number, since it uses less digits than its factorization.

21054023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21054023 is about 4588.4663014999. The cubic root of 21054023 is about 276.1287949961.

Adding to 21054023 its reverse (32045012), we get a palindrome (53099035).

The spelling of 21054023 in words is "twenty-one million, fifty-four thousand, twenty-three".