20421222103144 has 8 divisors (see below), whose sum is σ = 38289791443410. Its totient is φ = 10210611051568.

The previous prime is 20421222103141. The next prime is 20421222103151. The reversal of 20421222103144 is 44130122212402.

It can be written as a sum of positive squares in only one way, i.e., 11980860750244 + 8440361352900 = 3461338^2 + 2905230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20421222103141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1276326381439 + ... + 1276326381454.

Almost surely, 2^{20421222103144} is an apocalyptic number.

It is an amenable number.

20421222103144 is a deficient number, since it is larger than the sum of its proper divisors (17868569340266).

20421222103144 is a wasteful number, since it uses less digits than its factorization.

20421222103144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552652762899 (or 2552652762895 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 20421222103144 its reverse (44130122212402), we get a palindrome (64551344315546).

The spelling of 20421222103144 in words is "twenty trillion, four hundred twenty-one billion, two hundred twenty-two million, one hundred three thousand, one hundred forty-four".