2221511 has 2 divisors, whose sum is σ = 2221512. Its totient is φ = 2221510.

The previous prime is 2221507. The next prime is 2221523. The reversal of 2221511 is 1151222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221511 - 2² = 2221507 is a prime.

It is a super-2 number, since 2×2221511² = 9870222246242, which contains 22 as substring.

It is an Ulam number.

It is equal to p₁₆₄₁₂₀ and since 2221511 and 164120 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110755 + 1110756.

It is an arithmetic number, because the mean of its divisors is an integer number (1110756).

2^2221511 is an apocalyptic number.

2221511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221511 is an equidigital number, since it uses as much as digits as its factorization.

2221511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40, while the sum is 14.

The square root of 2221511 is about 1490.4734147243. The cubic root of 2221511 is about 130.4816648492.

Adding to 2221511 its reverse (1151222), we get a palindrome (3372733).

The spelling of 2221511 in words is "two million, two hundred twenty-one thousand, five hundred eleven".