1011012221 has 4 divisors (see below), whose sum is σ = 1014201852. Its totient is φ = 1007822592.

The previous prime is 1011012157. The next prime is 1011012229. The reversal of 1011012221 is 1222101101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87703225 + 923308996 = 9365^2 + 30386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011012221 - 2⁶ = 1011012157 is a prime.

It is a super-2 number, since 2×1011012221² = 2044291422022705682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011012229) 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, 1594340 + ... + 1594973.

It is an arithmetic number, because the mean of its divisors is an integer number (253550463).

Almost surely, 2^1011012221 is an apocalyptic number.

It is an amenable number.

1011012221 is a deficient number, since it is larger than the sum of its proper divisors (3189631).

1011012221 is an equidigital number, since it uses as much as digits as its factorization.

1011012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189630.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1011012221 is about 31796.4183674828. The cubic root of 1011012221 is about 1003.6573478330.

Adding to 1011012221 its reverse (1222101101), we get a palindrome (2233113322).

The spelling of 1011012221 in words is "one billion, eleven million, twelve thousand, two hundred twenty-one".