221613011 has 2 divisors, whose sum is σ = 221613012. Its totient is φ = 221613010.

The previous prime is 221612999. The next prime is 221613053. The reversal of 221613011 is 110316122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221613011 - 2⁶ = 221612947 is a prime.

It is a super-2 number, since 2×221613011² = 98224653288972242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221613811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110806505 + 110806506.

It is an arithmetic number, because the mean of its divisors is an integer number (110806506).

Almost surely, 2^221613011 is an apocalyptic number.

221613011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221613011 is an equidigital number, since it uses as much as digits as its factorization.

221613011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 221613011 is about 14886.6722607841. The cubic root of 221613011 is about 605.1528525747.

Adding to 221613011 its reverse (110316122), we get a palindrome (331929133).

The spelling of 221613011 in words is "two hundred twenty-one million, six hundred thirteen thousand, eleven".