2101221201023 has 12 divisors (see below), whose sum is σ = 2588058767232. Its totient is φ = 1695102816960.

The previous prime is 2101221200987. The next prime is 2101221201043. The reversal of 2101221201023 is 3201021221012.

It is not a de Polignac number, because 2101221201023 - 2¹² = 2101221196927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101221200992 and 2101221201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101221201043) 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 11 ways as a sum of consecutive naturals, for example, 1261236383 + ... + 1261238048.

It is an arithmetic number, because the mean of its divisors is an integer number (215671563936).

Almost surely, 2^{2101221201023} is an apocalyptic number.

2101221201023 is a deficient number, since it is larger than the sum of its proper divisors (486837566209).

2101221201023 is a wasteful number, since it uses less digits than its factorization.

2101221201023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522474462 (or 2522474455 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2101221201023 its reverse (3201021221012), we get a palindrome (5302242422035).

The spelling of 2101221201023 in words is "two trillion, one hundred one billion, two hundred twenty-one million, two hundred one thousand, twenty-three".