21216404162215 has 16 divisors (see below), whose sum is σ = 26640978391296. Its totient is φ = 16200594950400.

The previous prime is 21216404162203. The next prime is 21216404162231. The reversal of 21216404162215 is 51226140461212.

It is not a de Polignac number, because 21216404162215 - 2¹¹ = 21216404160167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 937523116 + ... + 937545745.

It is an arithmetic number, because the mean of its divisors is an integer number (1665061149456).

Almost surely, 2^{21216404162215} is an apocalyptic number.

21216404162215 is a deficient number, since it is larger than the sum of its proper divisors (5424574229081).

21216404162215 is a wasteful number, since it uses less digits than its factorization.

21216404162215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875068970.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21216404162215 in words is "twenty-one trillion, two hundred sixteen billion, four hundred four million, one hundred sixty-two thousand, two hundred fifteen".