21407788267 has 2 divisors, whose sum is σ = 21407788268. Its totient is φ = 21407788266.

The previous prime is 21407788253. The next prime is 21407788291. The reversal of 21407788267 is 76288770412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21407788267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21407782267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703894133 + 10703894134.

It is an arithmetic number, because the mean of its divisors is an integer number (10703894134).

Almost surely, 2^21407788267 is an apocalyptic number.

21407788267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21407788267 is an equidigital number, since it uses as much as digits as its factorization.

21407788267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2107392, while the sum is 52.

The spelling of 21407788267 in words is "twenty-one billion, four hundred seven million, seven hundred eighty-eight thousand, two hundred sixty-seven".