21254645212 has 6 divisors (see below), whose sum is σ = 37195629128. Its totient is φ = 10627322604.

The previous prime is 21254645201. The next prime is 21254645213.

21254645212 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254645213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2656830648 + ... + 2656830655.

Almost surely, 2^21254645212 is an apocalyptic number.

It is an amenable number.

21254645212 is a deficient number, since it is larger than the sum of its proper divisors (15940983916).

21254645212 is a wasteful number, since it uses less digits than its factorization.

21254645212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5313661307 (or 5313661305 counting only the distinct ones).

The product of its digits is 38400, while the sum is 34.

The spelling of 21254645212 in words is "twenty-one billion, two hundred fifty-four million, six hundred forty-five thousand, two hundred twelve".