2100209809639 has 2 divisors, whose sum is σ = 2100209809640. Its totient is φ = 2100209809638.

The previous prime is 2100209809597. The next prime is 2100209809673. The reversal of 2100209809639 is 9369089020012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100209809639 - 2³⁹ = 1550453995751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100209809592 and 2100209809601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100209809039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050104904819 + 1050104904820.

It is an arithmetic number, because the mean of its divisors is an integer number (1050104904820).

Almost surely, 2^{2100209809639} is an apocalyptic number.

2100209809639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100209809639 is an equidigital number, since it uses as much as digits as its factorization.

2100209809639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 2100209809639 in words is "two trillion, one hundred billion, two hundred nine million, eight hundred nine thousand, six hundred thirty-nine".