21221524541033 has 4 divisors (see below), whose sum is σ = 21221547806340. Its totient is φ = 21221501275728.

The previous prime is 21221524541023. The next prime is 21221524541069. The reversal of 21221524541033 is 33014542512212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164099528464 + 21057425012569 = 405092^2 + 4588837^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221524541033 - 2²² = 21221520346729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221524540984 and 21221524541002.

It is not an unprimeable number, because it can be changed into a prime (21221524541023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10206110 + ... + 12108167.

It is an arithmetic number, because the mean of its divisors is an integer number (5305386951585).

Almost surely, 2^{21221524541033} is an apocalyptic number.

It is an amenable number.

21221524541033 is a deficient number, since it is larger than the sum of its proper divisors (23265307).

21221524541033 is an equidigital number, since it uses as much as digits as its factorization.

21221524541033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23265306.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21221524541033 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-four million, five hundred forty-one thousand, thirty-three".