21053427 has 8 divisors (see below), whose sum is σ = 28334016. Its totient is φ = 13904232.

The previous prime is 21053411. The next prime is 21053437. The reversal of 21053427 is 72435012.

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

It is not a de Polignac number, because 21053427 - 2⁴ = 21053411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21053397 and 21053406.

It is not an unprimeable number, because it can be changed into a prime (21053437) 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, 32473 + ... + 33114.

It is an arithmetic number, because the mean of its divisors is an integer number (3541752).

Almost surely, 2^21053427 is an apocalyptic number.

21053427 is a deficient number, since it is larger than the sum of its proper divisors (7280589).

21053427 is a wasteful number, since it uses less digits than its factorization.

21053427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65697.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21053427 is about 4588.4013555922. The cubic root of 21053427 is about 276.1261894084.

Adding to 21053427 its reverse (72435012), we get a palindrome (93488439).

The spelling of 21053427 in words is "twenty-one million, fifty-three thousand, four hundred twenty-seven".