21092819506 has 16 divisors (see below), whose sum is σ = 34535971008. Its totient is φ = 9581965200.

The previous prime is 21092819483. The next prime is 21092819521. The reversal of 21092819506 is 60591829012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245910 + ... + 320401.

It is an arithmetic number, because the mean of its divisors is an integer number (2158498188).

Almost surely, 2^21092819506 is an apocalyptic number.

21092819506 is a deficient number, since it is larger than the sum of its proper divisors (13443151502).

21092819506 is a wasteful number, since it uses less digits than its factorization.

21092819506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568017.

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 21092819506 in words is "twenty-one billion, ninety-two million, eight hundred nineteen thousand, five hundred six".