21270222605 has 8 divisors (see below), whose sum is σ = 27025694712. Its totient is φ = 16015226368.

The previous prime is 21270222599. The next prime is 21270222641. The reversal of 21270222605 is 50622207212.

It can be written as a sum of positive squares in 4 ways, for example, as 4179105316 + 17091117289 = 64646^2 + 130733^2 .

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 21270222605 - 2¹² = 21270218509 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 7 ways as a sum of consecutive naturals, for example, 125118872 + ... + 125119041.

It is an arithmetic number, because the mean of its divisors is an integer number (3378211839).

Almost surely, 2^21270222605 is an apocalyptic number.

It is an amenable number.

21270222605 is a deficient number, since it is larger than the sum of its proper divisors (5755472107).

21270222605 is a wasteful number, since it uses less digits than its factorization.

21270222605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250237935.

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 21270222605 its reverse (50622207212), we get a palindrome (71892429817).

The spelling of 21270222605 in words is "twenty-one billion, two hundred seventy million, two hundred twenty-two thousand, six hundred five".