2101201202021 has 4 divisors (see below), whose sum is σ = 2101572904332. Its totient is φ = 2100829499712.

The previous prime is 2101201201889. The next prime is 2101201202077. The reversal of 2101201202021 is 1202021021012.

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 1138732288996 + 962468913025 = 1067114^2 + 981055^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101201202021 - 2³⁸ = 1826323295077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101201201987 and 2101201202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101201202521) 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, 185842676 + ... + 185853981.

It is an arithmetic number, because the mean of its divisors is an integer number (525393226083).

Almost surely, 2^{2101201202021} is an apocalyptic number.

It is an amenable number.

2101201202021 is a deficient number, since it is larger than the sum of its proper divisors (371702311).

2101201202021 is an equidigital number, since it uses as much as digits as its factorization.

2101201202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371702310.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2101201202021 its reverse (1202021021012), we get a palindrome (3303222223033).

It can be divided in two parts, 210120 and 1202021, that added together give a palindrome (1412141).

The spelling of 2101201202021 in words is "two trillion, one hundred one billion, two hundred one million, two hundred two thousand, twenty-one".