2101202021 has 4 divisors (see below), whose sum is σ = 2126517792. Its totient is φ = 2075886252.

The previous prime is 2101201967. The next prime is 2101202029. The reversal of 2101202021 is 1202021012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101202021 - 2²⁶ = 2034093157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101201993 and 2101202011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101202029) 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 3 ways as a sum of consecutive naturals, for example, 12657761 + ... + 12657926.

It is an arithmetic number, because the mean of its divisors is an integer number (531629448).

Almost surely, 2^2101202021 is an apocalyptic number.

It is an amenable number.

2101202021 is a deficient number, since it is larger than the sum of its proper divisors (25315771).

2101202021 is an equidigital number, since it uses as much as digits as its factorization.

2101202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25315770.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2101202021 is about 45838.8701976827. The cubic root of 2101202021 is about 1280.8234490274.

Adding to 2101202021 its reverse (1202021012), we get a palindrome (3303223033).

The spelling of 2101202021 in words is "two billion, one hundred one million, two hundred two thousand, twenty-one".