21515400034441 has 8 divisors (see below), whose sum is σ = 21806643534080. Its totient is φ = 21224628951552.

The previous prime is 21515400034409. The next prime is 21515400034463. The reversal of 21515400034441 is 14443000451512.

It is a happy number.

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 21515400034441 - 2⁵ = 21515400034409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21515400034397 and 21515400034406.

It is not an unprimeable number, because it can be changed into a prime (21515400034241) 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, 118012485 + ... + 118194658.

It is an arithmetic number, because the mean of its divisors is an integer number (2725830441760).

Almost surely, 2^{21515400034441} is an apocalyptic number.

It is an amenable number.

21515400034441 is a deficient number, since it is larger than the sum of its proper divisors (291243499639).

21515400034441 is a wasteful number, since it uses less digits than its factorization.

21515400034441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236208375.

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21515400034441 its reverse (14443000451512), we get a palindrome (35958400485953).

The spelling of 21515400034441 in words is "twenty-one trillion, five hundred fifteen billion, four hundred million, thirty-four thousand, four hundred forty-one".