21471789677 has 16 divisors (see below), whose sum is σ = 23474949120. Its totient is φ = 19520904000.

The previous prime is 21471789659. The next prime is 21471789707. The reversal of 21471789677 is 77698717412.

It is not a de Polignac number, because 21471789677 - 2⁶ = 21471789613 is a prime.

It is a super-2 number, since 2×21471789677² (a number of 21 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 (21471789877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207974 + ... + 293592.

It is an arithmetic number, because the mean of its divisors is an integer number (1467184320).

Almost surely, 2^21471789677 is an apocalyptic number.

It is an amenable number.

21471789677 is a deficient number, since it is larger than the sum of its proper divisors (2003159443).

21471789677 is a wasteful number, since it uses less digits than its factorization.

21471789677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85924.

The product of its digits is 8297856, while the sum is 59.

The spelling of 21471789677 in words is "twenty-one billion, four hundred seventy-one million, seven hundred eighty-nine thousand, six hundred seventy-seven".