2221137645 has 16 divisors (see below), whose sum is σ = 3563108352. Its totient is φ = 1181510720.

The previous prime is 2221137617. The next prime is 2221137647. The reversal of 2221137645 is 5467311222.

It is not a de Polignac number, because 2221137645 - 2⁸ = 2221137389 is a prime.

It is a super-3 number, since 3×2221137645³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221137647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187566 + ... + 199055.

It is an arithmetic number, because the mean of its divisors is an integer number (222694272).

Almost surely, 2^2221137645 is an apocalyptic number.

It is an amenable number.

2221137645 is a deficient number, since it is larger than the sum of its proper divisors (1341970707).

2221137645 is a wasteful number, since it uses less digits than its factorization.

2221137645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387012.

The product of its digits is 20160, while the sum is 33.

The square root of 2221137645 is about 47128.9469965116. The cubic root of 2221137645 is about 1304.7435470285.

Adding to 2221137645 its reverse (5467311222), we get a palindrome (7688448867).

The spelling of 2221137645 in words is "two billion, two hundred twenty-one million, one hundred thirty-seven thousand, six hundred forty-five".