101221101011 has 4 divisors (see below), whose sum is σ = 106548527400. Its totient is φ = 95893674624.

The previous prime is 101221101001. The next prime is 101221101013. The reversal of 101221101011 is 110101122101.

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

It is a cyclic number.

It is not a de Polignac number, because 101221101011 - 2¹⁸ = 101220838867 is a prime.

It is a super-2 number, since 2×101221101011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221100983 and 101221101001.

It is not an unprimeable number, because it can be changed into a prime (101221101013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2663713166 + ... + 2663713203.

It is an arithmetic number, because the mean of its divisors is an integer number (26637131850).

Almost surely, 2^101221101011 is an apocalyptic number.

101221101011 is a deficient number, since it is larger than the sum of its proper divisors (5327426389).

101221101011 is an equidigital number, since it uses as much as digits as its factorization.

101221101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327426388.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 101221101011 its reverse (110101122101), we get a palindrome (211322223112).

The spelling of 101221101011 in words is "one hundred one billion, two hundred twenty-one million, one hundred one thousand, eleven".