2221826261 has 4 divisors (see below), whose sum is σ = 2223917472. Its totient is φ = 2219735052.

The previous prime is 2221826251. The next prime is 2221826263. The reversal of 2221826261 is 1626281222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1626281222 = 2 ⋅813140611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221826261 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 (2221826263) 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, 1044011 + ... + 1046136.

It is an arithmetic number, because the mean of its divisors is an integer number (555979368).

Almost surely, 2^2221826261 is an apocalyptic number.

It is an amenable number.

2221826261 is a deficient number, since it is larger than the sum of its proper divisors (2091211).

2221826261 is a wasteful number, since it uses less digits than its factorization.

2221826261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091210.

The product of its digits is 9216, while the sum is 32.

The square root of 2221826261 is about 47136.2520890238. The cubic root of 2221826261 is about 1304.8783689969.

The spelling of 2221826261 in words is "two billion, two hundred twenty-one million, eight hundred twenty-six thousand, two hundred sixty-one".