1011221201 has 4 divisors (see below), whose sum is σ = 1011302400. Its totient is φ = 1011140004.

The previous prime is 1011221161. The next prime is 1011221207. The reversal of 1011221201 is 1021221101.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1011221201 - 2¹⁸ = 1010959057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011221207) 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, 17561 + ... + 48278.

It is an arithmetic number, because the mean of its divisors is an integer number (252825600).

Almost surely, 2^1011221201 is an apocalyptic number.

It is an amenable number.

1011221201 is a deficient number, since it is larger than the sum of its proper divisors (81199).

1011221201 is an equidigital number, since it uses as much as digits as its factorization.

1011221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81198.

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

The square root of 1011221201 is about 31799.7044168653. The cubic root of 1011221201 is about 1003.7264963089.

Adding to 1011221201 its reverse (1021221101), we get a palindrome (2032442302).

It can be divided in two parts, 10112 and 21201, that added together give a palindrome (31313).

The spelling of 1011221201 in words is "one billion, eleven million, two hundred twenty-one thousand, two hundred one".