21610404111215 has 8 divisors (see below), whose sum is σ = 25933747408128. Its totient is φ = 17287481639200.

The previous prime is 21610404111203. The next prime is 21610404111217. The reversal of 21610404111215 is 51211140401612.

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

It is not a de Polignac number, because 21610404111215 - 2⁴ = 21610404111199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610404111217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105093236 + ... + 105298665.

It is an arithmetic number, because the mean of its divisors is an integer number (3241718426016).

Almost surely, 2^{21610404111215} is an apocalyptic number.

21610404111215 is a deficient number, since it is larger than the sum of its proper divisors (4323343296913).

21610404111215 is a wasteful number, since it uses less digits than its factorization.

21610404111215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210412449.

The product of its (nonzero) digits is 1920, while the sum is 29.

Adding to 21610404111215 its reverse (51211140401612), we get a palindrome (72821544512827).

The spelling of 21610404111215 in words is "twenty-one trillion, six hundred ten billion, four hundred four million, one hundred eleven thousand, two hundred fifteen".