101001201021 has 16 divisors (see below), whose sum is σ = 171007324800. Its totient is φ = 57714971904.

The previous prime is 101001201013. The next prime is 101001201031. The reversal of 101001201021 is 120102100101.

It is a happy number.

It is not a de Polignac number, because 101001201021 - 2³ = 101001201013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 101001200994 and 101001201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101001201001) 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, 267198756 + ... + 267199133.

It is an arithmetic number, because the mean of its divisors is an integer number (10687957800).

Almost surely, 2^101001201021 is an apocalyptic number.

It is an amenable number.

101001201021 is a deficient number, since it is larger than the sum of its proper divisors (70006123779).

101001201021 is an equidigital number, since it uses as much as digits as its factorization.

101001201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534397905 (or 534397899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 101001201021 its reverse (120102100101), we get a palindrome (221103301122).

It can be divided in two parts, 10100 and 1201021, that added together give a palindrome (1211121).

The spelling of 101001201021 in words is "one hundred one billion, one million, two hundred one thousand, twenty-one".