2102321020021 has 4 divisors (see below), whose sum is σ = 2102547645772. Its totient is φ = 2102094394272.

The previous prime is 2102321019961. The next prime is 2102321020049. The reversal of 2102321020021 is 1200201232012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 840450731121 + 1261870288900 = 916761^2 + 1123330^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102321020021 - 2¹³ = 2102321011829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102321019977 and 2102321020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102321080021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113298960 + ... + 113317513.

It is an arithmetic number, because the mean of its divisors is an integer number (525636911443).

Almost surely, 2^{2102321020021} is an apocalyptic number.

It is an amenable number.

2102321020021 is a deficient number, since it is larger than the sum of its proper divisors (226625751).

2102321020021 is an equidigital number, since it uses as much as digits as its factorization.

2102321020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226625750.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2102321020021 its reverse (1200201232012), we get a palindrome (3302522252033).

The spelling of 2102321020021 in words is "two trillion, one hundred two billion, three hundred twenty-one million, twenty thousand, twenty-one".