21012864227 has 8 divisors (see below), whose sum is σ = 21170783136. Its totient is φ = 20855011392.

The previous prime is 21012864221. The next prime is 21012864233. The reversal of 21012864227 is 72246821012.

It is an interprime number because it is at equal distance from previous prime (21012864221) and next prime (21012864233).

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

It is a cyclic number.

It is not a de Polignac number, because 21012864227 - 2⁴ = 21012864211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012864221) 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, 756713 + ... + 783989.

It is an arithmetic number, because the mean of its divisors is an integer number (2646347892).

Almost surely, 2^21012864227 is an apocalyptic number.

21012864227 is a deficient number, since it is larger than the sum of its proper divisors (157918909).

21012864227 is a wasteful number, since it uses less digits than its factorization.

21012864227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33037.

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 21012864227 in words is "twenty-one billion, twelve million, eight hundred sixty-four thousand, two hundred twenty-seven".