101221001020021 has 32 divisors (see below), whose sum is σ = 109702695223296. Its totient is φ = 93118177416000.

The previous prime is 101221001020019. The next prime is 101221001020033. The reversal of 101221001020021 is 120020100122101.

It is a cyclic number.

It is not a de Polignac number, because 101221001020021 - 2¹ = 101221001020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221001019983 and 101221001020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221001020721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 651359751 + ... + 651515131.

It is an arithmetic number, because the mean of its divisors is an integer number (3428209225728).

Almost surely, 2^{101221001020021} is an apocalyptic number.

It is an amenable number.

101221001020021 is a deficient number, since it is larger than the sum of its proper divisors (8481694203275).

101221001020021 is a wasteful number, since it uses less digits than its factorization.

101221001020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161073.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101221001020021 its reverse (120020100122101), we get a palindrome (221241101142122).

The spelling of 101221001020021 in words is "one hundred one trillion, two hundred twenty-one billion, one million, twenty thousand, twenty-one".