21221546005 has 16 divisors (see below), whose sum is σ = 27783762048. Its totient is φ = 15432280000.

The previous prime is 21221545979. The next prime is 21221546011. The reversal of 21221546005 is 50064512212.

It is not a de Polignac number, because 21221546005 - 2³³ = 12631611413 is a prime.

It is a super-3 number, since 3×21221546005³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1051560 + ... + 1071550.

It is an arithmetic number, because the mean of its divisors is an integer number (1736485128).

Almost surely, 2^21221546005 is an apocalyptic number.

It is an amenable number.

21221546005 is a deficient number, since it is larger than the sum of its proper divisors (6562216043).

21221546005 is a wasteful number, since it uses less digits than its factorization.

21221546005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39308.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21221546005 in words is "twenty-one billion, two hundred twenty-one million, five hundred forty-six thousand, five".