21525334220154 has 32 divisors (see below), whose sum is σ = 43144220021760. Its totient is φ = 7159536184752.

The previous prime is 21525334220153. The next prime is 21525334220171. The reversal of 21525334220154 is 45102243352512.

It is a super-2 number, since 2×21525334220154² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21525334220153) 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, 3067917 + ... + 7243119.

It is an arithmetic number, because the mean of its divisors is an integer number (1348256875680).

Almost surely, 2^{21525334220154} is an apocalyptic number.

21525334220154 is an abundant number, since it is smaller than the sum of its proper divisors (21618885801606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21525334220154 is a wasteful number, since it uses less digits than its factorization.

21525334220154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177074.

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21525334220154 its reverse (45102243352512), we get a palindrome (66627577572666).

The spelling of 21525334220154 in words is "twenty-one trillion, five hundred twenty-five billion, three hundred thirty-four million, two hundred twenty thousand, one hundred fifty-four".