21220041401 has 16 divisors (see below), whose sum is σ = 23346543360. Its totient is φ = 19168531200.

The previous prime is 21220041341. The next prime is 21220041413. The reversal of 21220041401 is 10414002212.

It is a de Polignac number, because none of the positive numbers 2^k-21220041401 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 21220041401.

It is not an unprimeable number, because it can be changed into a prime (21220041001) 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, 24626 + ... + 207476.

It is an arithmetic number, because the mean of its divisors is an integer number (1459158960).

Almost surely, 2^21220041401 is an apocalyptic number.

It is an amenable number.

21220041401 is a deficient number, since it is larger than the sum of its proper divisors (2126501959).

21220041401 is a wasteful number, since it uses less digits than its factorization.

21220041401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183056.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220041401 its reverse (10414002212), we get a palindrome (31634043613).

The spelling of 21220041401 in words is "twenty-one billion, two hundred twenty million, forty-one thousand, four hundred one".