21155003411 has 8 divisors (see below), whose sum is σ = 22210218240. Its totient is φ = 20111074632.

The previous prime is 21155003369. The next prime is 21155003431. The reversal of 21155003411 is 11430055112.

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 21155003411 - 2²² = 21150809107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21155003431) 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, 2817671 + ... + 2825168.

It is an arithmetic number, because the mean of its divisors is an integer number (2776277280).

Almost surely, 2^21155003411 is an apocalyptic number.

21155003411 is a deficient number, since it is larger than the sum of its proper divisors (1055214829).

21155003411 is a wasteful number, since it uses less digits than its factorization.

21155003411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643025.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21155003411 its reverse (11430055112), we get a palindrome (32585058523).

The spelling of 21155003411 in words is "twenty-one billion, one hundred fifty-five million, three thousand, four hundred eleven".