21253016473 has 16 divisors (see below), whose sum is σ = 23700499200. Its totient is φ = 18922962240.

The previous prime is 21253016423. The next prime is 21253016501. The reversal of 21253016473 is 37461035212.

It is not a de Polignac number, because 21253016473 - 2²¹ = 21250919321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21253016423) 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, 361348 + ... + 416026.

It is an arithmetic number, because the mean of its divisors is an integer number (1481281200).

Almost surely, 2^21253016473 is an apocalyptic number.

It is an amenable number.

21253016473 is a deficient number, since it is larger than the sum of its proper divisors (2447482727).

21253016473 is a wasteful number, since it uses less digits than its factorization.

21253016473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55752.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21253016473 in words is "twenty-one billion, two hundred fifty-three million, sixteen thousand, four hundred seventy-three".