21477376306277 has 4 divisors (see below), whose sum is σ = 21477550480716. Its totient is φ = 21477202131840.

The previous prime is 21477376306207. The next prime is 21477376306363. The reversal of 21477376306277 is 77260367377412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16259596517761 + 5217779788516 = 4032319^2 + 2284246^2 .

It is a cyclic number.

It is not a de Polignac number, because 21477376306277 - 2¹² = 21477376302181 is a prime.

It is a super-2 number, since 2×21477376306277² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477376306207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86902124 + ... + 87148917.

It is an arithmetic number, because the mean of its divisors is an integer number (5369387620179).

Almost surely, 2^{21477376306277} is an apocalyptic number.

It is an amenable number.

21477376306277 is a deficient number, since it is larger than the sum of its proper divisors (174174439).

21477376306277 is a wasteful number, since it uses less digits than its factorization.

21477376306277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174174438.

The product of its (nonzero) digits is 87127488, while the sum is 62.

The spelling of 21477376306277 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred seventy-six million, three hundred six thousand, two hundred seventy-seven".