21467981473 has 2 divisors, whose sum is σ = 21467981474. Its totient is φ = 21467981472.

The previous prime is 21467981453. The next prime is 21467981539. The reversal of 21467981473 is 37418976412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19908363409 + 1559618064 = 141097^2 + 39492^2 .

It is a cyclic number.

It is not a de Polignac number, because 21467981473 - 2⁵ = 21467981441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21467981473.

It is not a weakly prime, because it can be changed into another prime (21467981413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733990736 + 10733990737.

It is an arithmetic number, because the mean of its divisors is an integer number (10733990737).

Almost surely, 2^21467981473 is an apocalyptic number.

It is an amenable number.

21467981473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21467981473 is an equidigital number, since it uses as much as digits as its factorization.

21467981473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The spelling of 21467981473 in words is "twenty-one billion, four hundred sixty-seven million, nine hundred eighty-one thousand, four hundred seventy-three".