2087870621 has 2 divisors, whose sum is σ = 2087870622. Its totient is φ = 2087870620.

The previous prime is 2087870581. The next prime is 2087870647. The reversal of 2087870621 is 1260787802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1390171225 + 697699396 = 37285^2 + 26414^2 .

It is a cyclic number.

It is not a de Polignac number, because 2087870621 - 2¹⁸ = 2087608477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2087870021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043935310 + 1043935311.

It is an arithmetic number, because the mean of its divisors is an integer number (1043935311).

Almost surely, 2^2087870621 is an apocalyptic number.

It is an amenable number.

2087870621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2087870621 is an equidigital number, since it uses as much as digits as its factorization.

2087870621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 2087870621 is about 45693.2229220045. Note that the first 3 decimals coincide. The cubic root of 2087870621 is about 1278.1089060497.

The spelling of 2087870621 in words is "two billion, eighty-seven million, eight hundred seventy thousand, six hundred twenty-one".