2102261 has 4 divisors (see below), whose sum is σ = 2402592. Its totient is φ = 1801932.

The previous prime is 2102257. The next prime is 2102267. The reversal of 2102261 is 1622012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2102261 - 2² = 2102257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150155 + ... + 150168.

It is an arithmetic number, because the mean of its divisors is an integer number (600648).

2^2102261 is an apocalyptic number.

It is an amenable number.

2102261 is a deficient number, since it is larger than the sum of its proper divisors (300331).

2102261 is an equidigital number, since it uses as much as digits as its factorization.

2102261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300330.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2102261 is about 1449.9175838647. The cubic root of 2102261 is about 128.1038585780.

Adding to 2102261 its sum of digits (14), we get a triangular number (2102275 = T₂₀₅₀).

Adding to 2102261 its reverse (1622012), we get a palindrome (3724273).

Subtracting from 2102261 its reverse (1622012), we obtain a square (480249 = 693²).

The spelling of 2102261 in words is "two million, one hundred two thousand, two hundred sixty-one".