221201001011 has 4 divisors (see below), whose sum is σ = 221323824024. Its totient is φ = 221078178000.

The previous prime is 221201000989. The next prime is 221201001089. The reversal of 221201001011 is 110100102122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110100102122 = 2 ⋅55050051061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201001011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201000983 and 221201001001.

It is not an unprimeable number, because it can be changed into a prime (221201001911) 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, 61408805 + ... + 61412406.

It is an arithmetic number, because the mean of its divisors is an integer number (55330956006).

Almost surely, 2^221201001011 is an apocalyptic number.

221201001011 is a deficient number, since it is larger than the sum of its proper divisors (122823013).

221201001011 is a wasteful number, since it uses less digits than its factorization.

221201001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122823012.

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

Adding to 221201001011 its reverse (110100102122), we get a palindrome (331301103133).

The spelling of 221201001011 in words is "two hundred twenty-one billion, two hundred one million, one thousand, eleven".