21153131405 has 32 divisors (see below), whose sum is σ = 29148484608. Its totient is φ = 14435942400.

The previous prime is 21153131401. The next prime is 21153131407. The reversal of 21153131405 is 50413135112.

It is not a de Polignac number, because 21153131405 - 2² = 21153131401 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 (21153131401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7918220 + ... + 7920890.

It is an arithmetic number, because the mean of its divisors is an integer number (910890144).

Almost surely, 2^21153131405 is an apocalyptic number.

It is an amenable number.

21153131405 is a deficient number, since it is larger than the sum of its proper divisors (7995353203).

21153131405 is a wasteful number, since it uses less digits than its factorization.

21153131405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 21153131405 its reverse (50413135112), we get a palindrome (71566266517).

The spelling of 21153131405 in words is "twenty-one billion, one hundred fifty-three million, one hundred thirty-one thousand, four hundred five".