1047219221 has 4 divisors (see below), whose sum is σ = 1047299244. Its totient is φ = 1047139200.

The previous prime is 1047219191. The next prime is 1047219223. The reversal of 1047219221 is 1229127401.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1229127401 = 31 ⋅39649271.

It can be written as a sum of positive squares in 2 ways, for example, as 650811121 + 396408100 = 25511^2 + 19910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1047219221 - 2¹⁴ = 1047202837 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 (1047219223) 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, 15290 + ... + 48251.

It is an arithmetic number, because the mean of its divisors is an integer number (261824811).

Almost surely, 2^1047219221 is an apocalyptic number.

It is an amenable number.

1047219221 is a deficient number, since it is larger than the sum of its proper divisors (80023).

1047219221 is an equidigital number, since it uses as much as digits as its factorization.

1047219221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80022.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1047219221 is about 32360.7666936369. The cubic root of 1047219221 is about 1015.4983020821.

The spelling of 1047219221 in words is "one billion, forty-seven million, two hundred nineteen thousand, two hundred twenty-one".