21525354211 has 16 divisors (see below), whose sum is σ = 22002140160. Its totient is φ = 21054523360.

The previous prime is 21525354209. The next prime is 21525354259. The reversal of 21525354211 is 11245352512.

It is a cyclic number.

It is not a de Polignac number, because 21525354211 - 2¹ = 21525354209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21525354311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5206101 + ... + 5210233.

It is an arithmetic number, because the mean of its divisors is an integer number (1375133760).

Almost surely, 2^21525354211 is an apocalyptic number.

21525354211 is a deficient number, since it is larger than the sum of its proper divisors (476785949).

21525354211 is a wasteful number, since it uses less digits than its factorization.

21525354211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4826.

The product of its digits is 12000, while the sum is 31.

The spelling of 21525354211 in words is "twenty-one billion, five hundred twenty-five million, three hundred fifty-four thousand, two hundred eleven".