2101644020355 has 64 divisors (see below), whose sum is σ = 3731236171776. Its totient is φ = 1001590128000.

The previous prime is 2101644020353. The next prime is 2101644020389. The reversal of 2101644020355 is 5530204461012.

It is not a de Polignac number, because 2101644020355 - 2¹ = 2101644020353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2101644020353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3606672 + ... + 4148658.

It is an arithmetic number, because the mean of its divisors is an integer number (58300565184).

Almost surely, 2^{2101644020355} is an apocalyptic number.

2101644020355 is a deficient number, since it is larger than the sum of its proper divisors (1629592151421).

2101644020355 is a wasteful number, since it uses less digits than its factorization.

2101644020355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542408.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 2101644020355 its reverse (5530204461012), we get a palindrome (7631848481367).

The spelling of 2101644020355 in words is "two trillion, one hundred one billion, six hundred forty-four million, twenty thousand, three hundred fifty-five".