2011220501 has 4 divisors (see below), whose sum is σ = 2012161152. Its totient is φ = 2010279852.

The previous prime is 2011220461. The next prime is 2011220503. The reversal of 2011220501 is 1050221102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011220501 - 2¹⁸ = 2010958357 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 (2011220503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467111 + ... + 471396.

It is an arithmetic number, because the mean of its divisors is an integer number (503040288).

Almost surely, 2^2011220501 is an apocalyptic number.

It is an amenable number.

2011220501 is a deficient number, since it is larger than the sum of its proper divisors (940651).

2011220501 is an equidigital number, since it uses as much as digits as its factorization.

2011220501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940650.

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

The square root of 2011220501 is about 44846.6331066224. The cubic root of 2011220501 is about 1262.2728149323.

Adding to 2011220501 its reverse (1050221102), we get a palindrome (3061441603).

The spelling of 2011220501 in words is "two billion, eleven million, two hundred twenty thousand, five hundred one".