101221011031 has 6 divisors (see below), whose sum is σ = 117746890440. Its totient is φ = 86760866556.

The previous prime is 101221011013. The next prime is 101221011077. The reversal of 101221011031 is 130110122101.

It is a happy number.

It is not a de Polignac number, because 101221011031 - 2¹⁵ = 101220978263 is a prime.

It is a super-2 number, since 2×101221011031² (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 (101221011131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1032867411 + ... + 1032867508.

It is an arithmetic number, because the mean of its divisors is an integer number (19624481740).

Almost surely, 2^101221011031 is an apocalyptic number.

101221011031 is a deficient number, since it is larger than the sum of its proper divisors (16525879409).

101221011031 is an equidigital number, since it uses as much as digits as its factorization.

101221011031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065734933 (or 2065734926 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 101221011031 its reverse (130110122101), we get a palindrome (231331133132).

The spelling of 101221011031 in words is "one hundred one billion, two hundred twenty-one million, eleven thousand, thirty-one".