101211020221 has 4 divisors (see below), whose sum is σ = 101245959612. Its totient is φ = 101176080832.

The previous prime is 101211020203. The next prime is 101211020279. The reversal of 101211020221 is 122020112101.

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 36193160025 + 65017860196 = 190245^2 + 254986^2 .

It is a cyclic number.

It is not a de Polignac number, because 101211020221 - 2⁹ = 101211019709 is a prime.

It is a super-2 number, since 2×101211020221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211020201) 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, 17465350 + ... + 17471143.

It is an arithmetic number, because the mean of its divisors is an integer number (25311489903).

Almost surely, 2^101211020221 is an apocalyptic number.

It is an amenable number.

101211020221 is a deficient number, since it is larger than the sum of its proper divisors (34939391).

101211020221 is an equidigital number, since it uses as much as digits as its factorization.

101211020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34939390.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101211020221 its reverse (122020112101), we get a palindrome (223231132322).

The spelling of 101211020221 in words is "one hundred one billion, two hundred eleven million, twenty thousand, two hundred twenty-one".