2101323021 has 16 divisors (see below), whose sum is σ = 3280115328. Its totient is φ = 1171468800.

The previous prime is 2101323001. The next prime is 2101323023. The reversal of 2101323021 is 1203231012.

It is not a de Polignac number, because 2101323021 - 2⁶ = 2101322957 is a prime.

It is a super-3 number, since 3×2101323021³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101323023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219420 + ... + 1221141.

It is an arithmetic number, because the mean of its divisors is an integer number (205007208).

Almost surely, 2^2101323021 is an apocalyptic number.

2101323021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2101323021 is a deficient number, since it is larger than the sum of its proper divisors (1178792307).

2101323021 is a wasteful number, since it uses less digits than its factorization.

2101323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440612.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2101323021 is about 45840.1900192397. The cubic root of 2101323021 is about 1280.8480344252.

Adding to 2101323021 its reverse (1203231012), we get a palindrome (3304554033).

It can be divided in two parts, 210 and 1323021, that added together give a palindrome (1323231).

The spelling of 2101323021 in words is "two billion, one hundred one million, three hundred twenty-three thousand, twenty-one".