21267076212 has 18 divisors (see below), whose sum is σ = 53758442738. Its totient is φ = 7089025392.

The previous prime is 21267076151. The next prime is 21267076213.

It is a happy number.

21267076212 is a `hidden beast` number, since 2 + 1 + 26 + 7 + 0 + 7 + 621 + 2 = 666.

21267076212 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 16280739216 + 4986336996 = 127596^2 + 70614^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 590752117 = 21267076212 / (2 + 1 + 2 + 6 + 7 + 0 + 7 + 6 + 2 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267076213) 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, 295376023 + ... + 295376094.

Almost surely, 2^21267076212 is an apocalyptic number.

It is an amenable number.

21267076212 is an abundant number, since it is smaller than the sum of its proper divisors (32491366526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21267076212 is a wasteful number, since it uses less digits than its factorization.

21267076212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590752127 (or 590752122 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

It can be divided in two parts, 212670 and 76212, that added together give a palindrome (288882).

The spelling of 21267076212 in words is "twenty-one billion, two hundred sixty-seven million, seventy-six thousand, two hundred twelve".