21440512222051 has 8 divisors (see below), whose sum is σ = 23414990596704. Its totient is φ = 19512492162240.

The previous prime is 21440512222039. The next prime is 21440512222079. The reversal of 21440512222051 is 15022221504412.

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 21440512222051 - 2¹⁹ = 21440511697763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440512222651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11614577746 + ... + 11614579591.

It is an arithmetic number, because the mean of its divisors is an integer number (2926873824588).

Almost surely, 2^{21440512222051} is an apocalyptic number.

21440512222051 is a deficient number, since it is larger than the sum of its proper divisors (1974478374653).

21440512222051 is a wasteful number, since it uses less digits than its factorization.

21440512222051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23229157421.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 21440512222051 its reverse (15022221504412), we get a palindrome (36462733726463).

The spelling of 21440512222051 in words is "twenty-one trillion, four hundred forty billion, five hundred twelve million, two hundred twenty-two thousand, fifty-one".