21514215 has 8 divisors (see below), whose sum is σ = 34422768. Its totient is φ = 11474240.

The previous prime is 21514211. The next prime is 21514247. The reversal of 21514215 is 51241512.

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

It is not a de Polignac number, because 21514215 - 2² = 21514211 is a prime.

It is a super-2 number, since 2×21514215² = 925722894132450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21514191 and 21514200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717126 + ... + 717155.

It is an arithmetic number, because the mean of its divisors is an integer number (4302846).

Almost surely, 2^21514215 is an apocalyptic number.

21514215 is a deficient number, since it is larger than the sum of its proper divisors (12908553).

21514215 is a wasteful number, since it uses less digits than its factorization.

21514215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434289.

The product of its digits is 400, while the sum is 21.

The square root of 21514215 is about 4638.3418373380. The cubic root of 21514215 is about 278.1261568777.

Adding to 21514215 its reverse (51241512), we get a palindrome (72755727).

The spelling of 21514215 in words is "twenty-one million, five hundred fourteen thousand, two hundred fifteen".