21066052215 has 32 divisors (see below), whose sum is σ = 36308676096. Its totient is φ = 10368051840.

The previous prime is 21066052193. The next prime is 21066052253. The reversal of 21066052215 is 51225066012.

It is not a de Polignac number, because 21066052215 - 2¹² = 21066048119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 784542 + ... + 810948.

It is an arithmetic number, because the mean of its divisors is an integer number (1134646128).

Almost surely, 2^21066052215 is an apocalyptic number.

21066052215 is a deficient number, since it is larger than the sum of its proper divisors (15242623881).

21066052215 is a wasteful number, since it uses less digits than its factorization.

21066052215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30519.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21066052215 in words is "twenty-one billion, sixty-six million, fifty-two thousand, two hundred fifteen".