21270177506 has 8 divisors (see below), whose sum is σ = 31975082220. Its totient is φ = 10611816768.

The previous prime is 21270177491. The next prime is 21270177541. The reversal of 21270177506 is 60577107212.

It can be written as a sum of positive squares in 2 ways, for example, as 17220000625 + 4050176881 = 131225^2 + 63641^2 .

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

It is a super-2 number, since 2×21270177506² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21270177506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11634851 + ... + 11636678.

Almost surely, 2^21270177506 is an apocalyptic number.

21270177506 is a deficient number, since it is larger than the sum of its proper divisors (10704904714).

21270177506 is a wasteful number, since it uses less digits than its factorization.

21270177506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23271988.

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 21270177506 in words is "twenty-one billion, two hundred seventy million, one hundred seventy-seven thousand, five hundred six".