2100002012621 has 2 divisors, whose sum is σ = 2100002012622. Its totient is φ = 2100002012620.

The previous prime is 2100002012597. The next prime is 2100002012629. The reversal of 2100002012621 is 1262102000012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1377818178025 + 722183834596 = 1173805^2 + 849814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100002012621 - 2³⁸ = 1825124105677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100002012621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100002012629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050001006310 + 1050001006311.

It is an arithmetic number, because the mean of its divisors is an integer number (1050001006311).

Almost surely, 2^{2100002012621} is an apocalyptic number.

It is an amenable number.

2100002012621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100002012621 is an equidigital number, since it uses as much as digits as its factorization.

2100002012621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2100002012621 its reverse (1262102000012), we get a palindrome (3362104012633).

The spelling of 2100002012621 in words is "two trillion, one hundred billion, two million, twelve thousand, six hundred twenty-one".