101221001011 has 16 divisors (see below), whose sum is σ = 112552167168. Its totient is φ = 90397785600.

The previous prime is 101221000967. The next prime is 101221001051. The reversal of 101221001011 is 110100122101.

It is not a de Polignac number, because 101221001011 - 2⁹ = 101221000499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101221001051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1669671 + ... + 1729231.

It is an arithmetic number, because the mean of its divisors is an integer number (7034510448).

Almost surely, 2^101221001011 is an apocalyptic number.

101221001011 is a deficient number, since it is larger than the sum of its proper divisors (11331166157).

101221001011 is a wasteful number, since it uses less digits than its factorization.

101221001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63822.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 101221001011 its reverse (110100122101), we get a palindrome (211321123112).

The spelling of 101221001011 in words is "one hundred one billion, two hundred twenty-one million, one thousand, eleven".