2221142641 has 3 divisors (see below), whose sum is σ = 2221189771. Its totient is φ = 2221095512.

The previous prime is 2221142621. The next prime is 2221142681. The reversal of 2221142641 is 1462411222.

The square root of 2221142641 is 47129.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 848241 + 2220294400 = 921^2 + 47120^2 .

It is not a de Polignac number, because 2221142641 - 2⁷ = 2221142513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221142621) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 23565 + ... + 70693.

Almost surely, 2^2221142641 is an apocalyptic number.

2221142641 is the 47129-th square number.

2221142641 is the 23565-th centered octagonal number.

It is an amenable number.

2221142641 is a deficient number, since it is larger than the sum of its proper divisors (47130).

2221142641 is an frugal number, since it uses more digits than its factorization.

2221142641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94258 (or 47129 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The cubic root of 2221142641 is about 1304.7445252800.

Multiplying 2221142641 by its sum of digits (25), we get a square (55528566025 = 235645²).

Adding to 2221142641 its reverse (1462411222), we get a palindrome (3683553863).

The spelling of 2221142641 in words is "two billion, two hundred twenty-one million, one hundred forty-two thousand, six hundred forty-one".