21121041342013 has 16 divisors (see below), whose sum is σ = 22490329086720. Its totient is φ = 19766101017600.

The previous prime is 21121041342001. The next prime is 21121041342097. The reversal of 21121041342013 is 31024314012112.

It is a cyclic number.

It is not a de Polignac number, because 21121041342013 - 2⁹ = 21121041341501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121041342913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1211493 + ... + 6611338.

It is an arithmetic number, because the mean of its divisors is an integer number (1405645567920).

Almost surely, 2^{21121041342013} is an apocalyptic number.

It is an amenable number.

21121041342013 is a deficient number, since it is larger than the sum of its proper divisors (1369287744707).

21121041342013 is a wasteful number, since it uses less digits than its factorization.

21121041342013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7823748.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21121041342013 its reverse (31024314012112), we get a palindrome (52145355354125).

The spelling of 21121041342013 in words is "twenty-one trillion, one hundred twenty-one billion, forty-one million, three hundred forty-two thousand, thirteen".