21232315 has 12 divisors (see below), whose sum is σ = 27590544. Its totient is φ = 15678624.

The previous prime is 21232307. The next prime is 21232363. The reversal of 21232315 is 51323212.

It is not a de Polignac number, because 21232315 - 2³ = 21232307 is a prime.

It is a super-2 number, since 2×21232315² = 901622400518450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232292 and 21232301.

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, 11719 + ... + 13408.

It is an arithmetic number, because the mean of its divisors is an integer number (2299212).

Almost surely, 2^21232315 is an apocalyptic number.

21232315 is a deficient number, since it is larger than the sum of its proper divisors (6358229).

21232315 is a wasteful number, since it uses less digits than its factorization.

21232315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25158 (or 25145 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 21232315 is about 4607.8536218070. The cubic root of 21232315 is about 276.9060531934.

Adding to 21232315 its reverse (51323212), we get a palindrome (72555527).

The spelling of 21232315 in words is "twenty-one million, two hundred thirty-two thousand, three hundred fifteen".