21341215 has 12 divisors (see below), whose sum is σ = 29790936. Its totient is φ = 14633808.

The previous prime is 21341191. The next prime is 21341249. The reversal of 21341215 is 51214312.

It is not a de Polignac number, because 21341215 - 2⁵ = 21341183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21341192 and 21341201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43309 + ... + 43798.

It is an arithmetic number, because the mean of its divisors is an integer number (2482578).

Almost surely, 2^21341215 is an apocalyptic number.

21341215 is a deficient number, since it is larger than the sum of its proper divisors (8449721).

21341215 is an equidigital number, since it uses as much as digits as its factorization.

21341215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87126 (or 87119 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 21341215 is about 4619.6552901705. The cubic root of 21341215 is about 277.3786608001.

Adding to 21341215 its reverse (51214312), we get a palindrome (72555527).

The spelling of 21341215 in words is "twenty-one million, three hundred forty-one thousand, two hundred fifteen".