21121041342015 has 48 divisors (see below), whose sum is σ = 39616407387648. Its totient is φ = 10774792090656.

The previous prime is 21121041342001. The next prime is 21121041342097. The reversal of 21121041342015 is 51024314012112.

21121041342015 is a `hidden beast` number, since 2 + 1 + 1 + 210 + 4 + 13 + 420 + 15 = 666.

21121041342015 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 21121041342015 - 2⁷ = 21121041341887 is a prime.

It is a super-2 number, since 2×21121041342015² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21121041342015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 377875819 + ... + 377931708.

It is an arithmetic number, because the mean of its divisors is an integer number (825341820576).

Almost surely, 2^{21121041342015} is an apocalyptic number.

21121041342015 is a deficient number, since it is larger than the sum of its proper divisors (18495366045633).

21121041342015 is an equidigital number, since it uses as much as digits as its factorization.

21121041342015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755807570 (or 755807558 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 21121041342015 its reverse (51024314012112), we get a palindrome (72145355354127).

The spelling of 21121041342015 in words is "twenty-one trillion, one hundred twenty-one billion, forty-one million, three hundred forty-two thousand, fifteen".