1011200221 has 4 divisors (see below), whose sum is σ = 1055165472. Its totient is φ = 967234972.

The previous prime is 1011200213. The next prime is 1011200243. The reversal of 1011200221 is 1220021101.

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 1011200221 - 2³ = 1011200213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011200198 and 1011200207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011200251) 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, 21982591 + ... + 21982636.

It is an arithmetic number, because the mean of its divisors is an integer number (263791368).

Almost surely, 2^1011200221 is an apocalyptic number.

It is an amenable number.

1011200221 is a deficient number, since it is larger than the sum of its proper divisors (43965251).

1011200221 is an equidigital number, since it uses as much as digits as its factorization.

1011200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43965250.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1011200221 is about 31799.3745378742. The cubic root of 1011200221 is about 1003.7195547589.

Adding to 1011200221 its reverse (1220021101), we get a palindrome (2231221322).

The spelling of 1011200221 in words is "one billion, eleven million, two hundred thousand, two hundred twenty-one".