21270115 has 8 divisors (see below), whose sum is σ = 25653600. Its totient is φ = 16929792.

The previous prime is 21270113. The next prime is 21270121. The reversal of 21270115 is 51107212.

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 21270115 - 2¹ = 21270113 is a prime.

It is a super-2 number, since 2×21270115² = 904835584226450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21270092 and 21270101.

It is not an unprimeable number, because it can be changed into a prime (21270113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9694 + ... + 11683.

It is an arithmetic number, because the mean of its divisors is an integer number (3206700).

Almost surely, 2^21270115 is an apocalyptic number.

21270115 is a deficient number, since it is larger than the sum of its proper divisors (4383485).

21270115 is a wasteful number, since it uses less digits than its factorization.

21270115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21581.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 21270115 is about 4611.9534906588. The cubic root of 21270115 is about 277.0702815317.

Adding to 21270115 its reverse (51107212), we get a palindrome (72377327).

The spelling of 21270115 in words is "twenty-one million, two hundred seventy thousand, one hundred fifteen".