19460453021 has 4 divisors (see below), whose sum is σ = 19462214652. Its totient is φ = 19458691392.

The previous prime is 19460453017. The next prime is 19460453063. The reversal of 19460453021 is 12035406491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1184116921 + 18276336100 = 34411^2 + 135190^2 .

It is a cyclic number.

It is not a de Polignac number, because 19460453021 - 2² = 19460453017 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 (19460453921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864140 + ... + 886373.

It is an arithmetic number, because the mean of its divisors is an integer number (4865553663).

Almost surely, 2^19460453021 is an apocalyptic number.

It is an amenable number.

19460453021 is a deficient number, since it is larger than the sum of its proper divisors (1761631).

19460453021 is a wasteful number, since it uses less digits than its factorization.

19460453021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761630.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 19460453021 in words is "nineteen billion, four hundred sixty million, four hundred fifty-three thousand, twenty-one".