101221131021 has 4 divisors (see below), whose sum is σ = 134961508032. Its totient is φ = 67480754012.

The previous prime is 101221130999. The next prime is 101221131061. The reversal of 101221131021 is 120131122101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101221131021 - 2⁹ = 101221130509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221131061) 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, 16870188501 + ... + 16870188506.

It is an arithmetic number, because the mean of its divisors is an integer number (33740377008).

Almost surely, 2^101221131021 is an apocalyptic number.

It is an amenable number.

101221131021 is a deficient number, since it is larger than the sum of its proper divisors (33740377011).

101221131021 is an equidigital number, since it uses as much as digits as its factorization.

101221131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33740377010.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 101221131021 its reverse (120131122101), we get a palindrome (221352253122).

It can be divided in two parts, 101 and 221131021, that added together give a palindrome (221131122).

The spelling of 101221131021 in words is "one hundred one billion, two hundred twenty-one million, one hundred thirty-one thousand, twenty-one".