2100536021 has 4 divisors (see below), whose sum is σ = 2100710112. Its totient is φ = 2100361932.

The previous prime is 2100535933. The next prime is 2100536047. The reversal of 2100536021 is 1206350012.

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 a de Polignac number, because none of the positive numbers 2^k-2100536021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100535984 and 2100536002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100556021) 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, 67481 + ... + 93566.

It is an arithmetic number, because the mean of its divisors is an integer number (525177528).

Almost surely, 2^2100536021 is an apocalyptic number.

It is an amenable number.

2100536021 is a deficient number, since it is larger than the sum of its proper divisors (174091).

2100536021 is a wasteful number, since it uses less digits than its factorization.

2100536021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174090.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2100536021 is about 45831.6050449905. The cubic root of 2100536021 is about 1280.6881108495.

Adding to 2100536021 its reverse (1206350012), we get a palindrome (3306886033).

The spelling of 2100536021 in words is "two billion, one hundred million, five hundred thirty-six thousand, twenty-one".