1011213221 has 2 divisors, whose sum is σ = 1011213222. Its totient is φ = 1011213220.

The previous prime is 1011213197. The next prime is 1011213253. The reversal of 1011213221 is 1223121101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851822596 + 159390625 = 29186^2 + 12625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011213221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011213196 and 1011213205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011213121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505606610 + 505606611.

It is an arithmetic number, because the mean of its divisors is an integer number (505606611).

Almost surely, 2^1011213221 is an apocalyptic number.

It is an amenable number.

1011213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011213221 is an equidigital number, since it uses as much as digits as its factorization.

1011213221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1011213221 is about 31799.5789437533. The cubic root of 1011213221 is about 1003.7238560167.

Adding to 1011213221 its reverse (1223121101), we get a palindrome (2234334322).

The spelling of 1011213221 in words is "one billion, eleven million, two hundred thirteen thousand, two hundred twenty-one".