21540510115829 has 8 divisors (see below), whose sum is σ = 21809076442272. Its totient is φ = 21272159077840.

The previous prime is 21540510115793. The next prime is 21540510115877. The reversal of 21540510115829 is 92851101504512.

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 21540510115829 - 2⁴⁴ = 3948324071413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21540510115829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540510115529) 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, 53620754 + ... + 54020979.

It is an arithmetic number, because the mean of its divisors is an integer number (2726134555284).

Almost surely, 2^{21540510115829} is an apocalyptic number.

It is an amenable number.

21540510115829 is a deficient number, since it is larger than the sum of its proper divisors (268566326443).

21540510115829 is a wasteful number, since it uses less digits than its factorization.

21540510115829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107644227.

The product of its (nonzero) digits is 144000, while the sum is 44.

The spelling of 21540510115829 in words is "twenty-one trillion, five hundred forty billion, five hundred ten million, one hundred fifteen thousand, eight hundred twenty-nine".