2101220087 has 2 divisors, whose sum is σ = 2101220088. Its totient is φ = 2101220086.

The previous prime is 2101220081. The next prime is 2101220167. The reversal of 2101220087 is 7800221012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101220087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101220081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050610043 + 1050610044.

It is an arithmetic number, because the mean of its divisors is an integer number (1050610044).

Almost surely, 2^2101220087 is an apocalyptic number.

2101220087 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101220087 is an equidigital number, since it uses as much as digits as its factorization.

2101220087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 2101220087 is about 45839.0672570898. The cubic root of 2101220087 is about 1280.8271198294.

Adding to 2101220087 its reverse (7800221012), we get a palindrome (9901441099).

The spelling of 2101220087 in words is "two billion, one hundred one million, two hundred twenty thousand, eighty-seven".