21477277412 has 12 divisors (see below), whose sum is σ = 37587857580. Its totient is φ = 10737889536.

The previous prime is 21477277391. The next prime is 21477277421.

21477277412 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 13517782756 + 7959494656 = 116266^2 + 89216^2 .

It is a super-2 number, since 2×21477277412² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120113 + ... + 239544.

It is an arithmetic number, because the mean of its divisors is an integer number (3132321465).

Almost surely, 2^21477277412 is an apocalyptic number.

It is an amenable number.

21477277412 is a deficient number, since it is larger than the sum of its proper divisors (16110580168).

21477277412 is a wasteful number, since it uses less digits than its factorization.

21477277412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374590 (or 374588 counting only the distinct ones).

The product of its digits is 307328, while the sum is 44.

The spelling of 21477277412 in words is "twenty-one billion, four hundred seventy-seven million, two hundred seventy-seven thousand, four hundred twelve".