2211457621 has 6 divisors (see below), whose sum is σ = 2264084790. Its totient is φ = 2160026568.

The previous prime is 2211457603. The next prime is 2211457637. The reversal of 2211457621 is 1267541122.

It can be written as a sum of positive squares in only one way, i.e., 2144708721 + 66748900 = 46311^2 + 8170^2 .

It is not a de Polignac number, because 2211457621 - 2¹¹ = 2211455573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211457681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596166 + ... + 599863.

It is an arithmetic number, because the mean of its divisors is an integer number (377347465).

Almost surely, 2^2211457621 is an apocalyptic number.

It is an amenable number.

2211457621 is a deficient number, since it is larger than the sum of its proper divisors (52627169).

2211457621 is an equidigital number, since it uses as much as digits as its factorization.

2211457621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196115 (or 1196072 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 2211457621 is about 47026.1376364251. The cubic root of 2211457621 is about 1302.8453694413.

Adding to 2211457621 its reverse (1267541122), we get a palindrome (3478998743).

The spelling of 2211457621 in words is "two billion, two hundred eleven million, four hundred fifty-seven thousand, six hundred twenty-one".