21162115 has 8 divisors (see below), whose sum is σ = 27348048. Its totient is φ = 15627360.

The previous prime is 21162107. The next prime is 21162131. The reversal of 21162115 is 51126112.

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

It is not a de Polignac number, because 21162115 - 2³ = 21162107 is a prime.

It is a super-2 number, since 2×21162115² = 895670222546450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21162092 and 21162101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162721 + ... + 162850.

It is an arithmetic number, because the mean of its divisors is an integer number (3418506).

Almost surely, 2^21162115 is an apocalyptic number.

21162115 is a deficient number, since it is larger than the sum of its proper divisors (6185933).

21162115 is a wasteful number, since it uses less digits than its factorization.

21162115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325589.

The product of its digits is 120, while the sum is 19.

The square root of 21162115 is about 4600.2298855601. The cubic root of 21162115 is about 276.6005398323.

Adding to 21162115 its reverse (51126112), we get a palindrome (72288227).

It can be divided in two parts, 211 and 62115, that added together give a palindrome (62326).

The spelling of 21162115 in words is "twenty-one million, one hundred sixty-two thousand, one hundred fifteen".