21413115 has 48 divisors (see below), whose sum is σ = 41041728. Its totient is φ = 10272768.

The previous prime is 21413101. The next prime is 21413123. The reversal of 21413115 is 51131412.

21413115 = 10² + 11² + ... + 400².

It is not a de Polignac number, because 21413115 - 2⁴ = 21413099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16987 + ... + 18203.

It is an arithmetic number, because the mean of its divisors is an integer number (855036).

Almost surely, 2^21413115 is an apocalyptic number.

21413115 is a deficient number, since it is larger than the sum of its proper divisors (19628613).

21413115 is a wasteful number, since it uses less digits than its factorization.

21413115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 1265 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21413115 is about 4627.4307126093. The cubic root of 21413115 is about 277.6898141328.

Adding to 21413115 its reverse (51131412), we get a palindrome (72544527).

It can be divided in two parts, 21413 and 115, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21413115 in words is "twenty-one million, four hundred thirteen thousand, one hundred fifteen".