21477677512 has 8 divisors (see below), whose sum is σ = 40270645350. Its totient is φ = 10738838752.

The previous prime is 21477677509. The next prime is 21477677519. The reversal of 21477677512 is 21577677412.

It can be written as a sum of positive squares in only one way, i.e., 16147801476 + 5329876036 = 127074^2 + 73006^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21477677512² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477677519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342354837 + ... + 1342354852.

Almost surely, 2^21477677512 is an apocalyptic number.

It is an amenable number.

21477677512 is a deficient number, since it is larger than the sum of its proper divisors (18792967838).

21477677512 is a wasteful number, since it uses less digits than its factorization.

21477677512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684709695 (or 2684709691 counting only the distinct ones).

The product of its digits is 1152480, while the sum is 49.

The spelling of 21477677512 in words is "twenty-one billion, four hundred seventy-seven million, six hundred seventy-seven thousand, five hundred twelve".