106421644021 has 16 divisors (see below), whose sum is σ = 139664770560. Its totient is φ = 78561431280.

The previous prime is 106421643997. The next prime is 106421644031. The reversal of 106421644021 is 120446124601.

It is a cyclic number.

It is not a de Polignac number, because 106421644021 - 2⁵ = 106421643989 is a prime.

It is a super-2 number, since 2×106421644021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106421644031) 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, 36369571 + ... + 36372496.

It is an arithmetic number, because the mean of its divisors is an integer number (8729048160).

Almost surely, 2^106421644021 is an apocalyptic number.

106421644021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

106421644021 is a deficient number, since it is larger than the sum of its proper divisors (33243126539).

106421644021 is a wasteful number, since it uses less digits than its factorization.

106421644021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72742104.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 106421644021 its reverse (120446124601), we get a palindrome (226867768622).

The spelling of 106421644021 in words is "one hundred six billion, four hundred twenty-one million, six hundred forty-four thousand, twenty-one".