21097780463 has 16 divisors (see below), whose sum is σ = 21396350976. Its totient is φ = 20802057120.

The previous prime is 21097780447. The next prime is 21097780477. The reversal of 21097780463 is 36408779012.

It is a cyclic number.

It is not a de Polignac number, because 21097780463 - 2⁴ = 21097780447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097710463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11421806 + ... + 11423652.

It is an arithmetic number, because the mean of its divisors is an integer number (1337271936).

Almost surely, 2^21097780463 is an apocalyptic number.

21097780463 is a deficient number, since it is larger than the sum of its proper divisors (298570513).

21097780463 is a wasteful number, since it uses less digits than its factorization.

21097780463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 21097780463 in words is "twenty-one billion, ninety-seven million, seven hundred eighty thousand, four hundred sixty-three".