1111022221 has 4 divisors (see below), whose sum is σ = 1111320000. Its totient is φ = 1110724444.

The previous prime is 1111022191. The next prime is 1111022257. The reversal of 1111022221 is 1222201111.

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 1111022221 - 2¹³ = 1111014029 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 (1111022021) 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, 143221 + ... + 150778.

It is an arithmetic number, because the mean of its divisors is an integer number (277830000).

Almost surely, 2^1111022221 is an apocalyptic number.

It is an amenable number.

1111022221 is a deficient number, since it is larger than the sum of its proper divisors (297779).

1111022221 is an equidigital number, since it uses as much as digits as its factorization.

1111022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297778.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1111022221 is about 33331.9999549982. Note that the first 4 decimals coincide. The cubic root of 1111022221 is about 1035.7165476904.

Adding to 1111022221 its reverse (1222201111), we get a palindrome (2333223332).

It can be divided in two parts, 11110 and 22221, that multiplied together give a triangular number (246875310 = T₂₂₂₂₀).

The spelling of 1111022221 in words is "one billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".