21220041131 has 4 divisors (see below), whose sum is σ = 21226869600. Its totient is φ = 21213212664.

The previous prime is 21220041127. The next prime is 21220041133. The reversal of 21220041131 is 13114002212.

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 21220041131 - 2² = 21220041127 is a prime.

It is a super-2 number, since 2×21220041131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220041133) 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, 3409571 + ... + 3415788.

It is an arithmetic number, because the mean of its divisors is an integer number (5306717400).

Almost surely, 2^21220041131 is an apocalyptic number.

21220041131 is a deficient number, since it is larger than the sum of its proper divisors (6828469).

21220041131 is an equidigital number, since it uses as much as digits as its factorization.

21220041131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828468.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21220041131 its reverse (13114002212), we get a palindrome (34334043343).

The spelling of 21220041131 in words is "twenty-one billion, two hundred twenty million, forty-one thousand, one hundred thirty-one".