21477676667 has 6 divisors (see below), whose sum is σ = 22452089772. Its totient is φ = 20543864132.

The previous prime is 21477676663. The next prime is 21477676673. The reversal of 21477676667 is 76667677412.

It is not a de Polignac number, because 21477676667 - 2² = 21477676663 is a prime.

It is a super-2 number, since 2×21477676667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21477676663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20299733 + ... + 20300790.

It is an arithmetic number, because the mean of its divisors is an integer number (3742014962).

Almost surely, 2^21477676667 is an apocalyptic number.

21477676667 is a deficient number, since it is larger than the sum of its proper divisors (974413105).

21477676667 is an equidigital number, since it uses as much as digits as its factorization.

21477676667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40600569 (or 40600546 counting only the distinct ones).

The product of its digits is 24893568, while the sum is 59.

The spelling of 21477676667 in words is "twenty-one billion, four hundred seventy-seven million, six hundred seventy-six thousand, six hundred sixty-seven".