2101352621 has 2 divisors, whose sum is σ = 2101352622. Its totient is φ = 2101352620.

The previous prime is 2101352599. The next prime is 2101352647. The reversal of 2101352621 is 1262531012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1801578025 + 299774596 = 42445^2 + 17314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101352621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101352651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050676310 + 1050676311.

It is an arithmetic number, because the mean of its divisors is an integer number (1050676311).

Almost surely, 2^2101352621 is an apocalyptic number.

It is an amenable number.

2101352621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101352621 is an equidigital number, since it uses as much as digits as its factorization.

2101352621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2101352621 is about 45840.5128788935. The cubic root of 2101352621 is about 1280.8540485606.

Adding to 2101352621 its reverse (1262531012), we get a palindrome (3363883633).

The spelling of 2101352621 in words is "two billion, one hundred one million, three hundred fifty-two thousand, six hundred twenty-one".