21220040130261 has 16 divisors (see below), whose sum is σ = 32335387852800. Its totient is φ = 12125703989808.

The previous prime is 21220040130253. The next prime is 21220040130323. The reversal of 21220040130261 is 16203104002212.

It is not a de Polignac number, because 21220040130261 - 2³ = 21220040130253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220040132261) 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, 7913820 + ... + 10250298.

It is an arithmetic number, because the mean of its divisors is an integer number (2020961740800).

Almost surely, 2^{21220040130261} is an apocalyptic number.

21220040130261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21220040130261 is a deficient number, since it is larger than the sum of its proper divisors (11115347722539).

21220040130261 is a wasteful number, since it uses less digits than its factorization.

21220040130261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768968.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21220040130261 its reverse (16203104002212), we get a palindrome (37423144132473).

The spelling of 21220040130261 in words is "twenty-one trillion, two hundred twenty billion, forty million, one hundred thirty thousand, two hundred sixty-one".