21154532362441 has 8 divisors (see below), whose sum is σ = 21263415564744. Its totient is φ = 21045883067520.

The previous prime is 21154532362433. The next prime is 21154532362459. The reversal of 21154532362441 is 14426323545112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 58001497225 + 21096530865216 = 240835^2 + 4593096^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21154532362441 - 2³ = 21154532362433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154532362471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58295500 + ... + 58657261.

It is an arithmetic number, because the mean of its divisors is an integer number (2657926945593).

Almost surely, 2^{21154532362441} is an apocalyptic number.

It is an amenable number.

21154532362441 is a deficient number, since it is larger than the sum of its proper divisors (108883202303).

21154532362441 is a wasteful number, since it uses less digits than its factorization.

21154532362441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116953691.

The product of its digits is 691200, while the sum is 43.

The spelling of 21154532362441 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-two million, three hundred sixty-two thousand, four hundred forty-one".