21352045221 has 24 divisors (see below), whose sum is σ = 33220210296. Its totient is φ = 13137379200.

The previous prime is 21352045219. The next prime is 21352045229. The reversal of 21352045221 is 12254025312.

21352045221 is a `hidden beast` number, since 2 + 135 + 2 + 0 + 4 + 522 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4030853121 + 17321192100 = 63489^2 + 131610^2 .

It is not a de Polignac number, because 21352045221 - 2¹ = 21352045219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352045229) 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 23 ways as a sum of consecutive naturals, for example, 831271 + ... + 856571.

It is an arithmetic number, because the mean of its divisors is an integer number (1384175429).

Almost surely, 2^21352045221 is an apocalyptic number.

It is an amenable number.

21352045221 is a deficient number, since it is larger than the sum of its proper divisors (11868165075).

21352045221 is a wasteful number, since it uses less digits than its factorization.

21352045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32533 (or 32530 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21352045221 in words is "twenty-one billion, three hundred fifty-two million, forty-five thousand, two hundred twenty-one".