21126767851 has 8 divisors (see below), whose sum is σ = 24168533984. Its totient is φ = 18090915840.

The previous prime is 21126767813. The next prime is 21126767887. The reversal of 21126767851 is 15876762112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21126767851 - 2⁹ = 21126767339 is a prime.

It is the 145351-st Hogben number.

It is not an unprimeable number, because it can be changed into a prime (21126767551) by changing a digit.

It is a nontrivial repunit in base 145350.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470870 + ... + 1485163.

It is an arithmetic number, because the mean of its divisors is an integer number (3021066748).

Almost surely, 2^21126767851 is an apocalyptic number.

21126767851 is a deficient number, since it is larger than the sum of its proper divisors (3041766133).

21126767851 is a wasteful number, since it uses less digits than its factorization.

21126767851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957061.

The product of its digits is 282240, while the sum is 46.

The spelling of 21126767851 in words is "twenty-one billion, one hundred twenty-six million, seven hundred sixty-seven thousand, eight hundred fifty-one".