21154540411 has 4 divisors (see below), whose sum is σ = 21155005872. Its totient is φ = 21154074952.

The previous prime is 21154540387. The next prime is 21154540453. The reversal of 21154540411 is 11404545112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21154540411 - 2¹⁹ = 21154016123 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 21154540411.

It is not an unprimeable number, because it can be changed into a prime (21154540481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156160 + ... + 258253.

It is an arithmetic number, because the mean of its divisors is an integer number (5288751468).

Almost surely, 2^21154540411 is an apocalyptic number.

21154540411 is a deficient number, since it is larger than the sum of its proper divisors (465461).

21154540411 is an equidigital number, since it uses as much as digits as its factorization.

21154540411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465460.

The product of its (nonzero) digits is 3200, while the sum is 28.

The spelling of 21154540411 in words is "twenty-one billion, one hundred fifty-four million, five hundred forty thousand, four hundred eleven".