101220302020021 has 4 divisors (see below), whose sum is σ = 101614155335532. Its totient is φ = 100826448704512.

The previous prime is 101220302020009. The next prime is 101220302020039. The reversal of 101220302020021 is 120020203022101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65209081145796 + 36011220874225 = 8075214^2 + 6000935^2 .

It is a cyclic number.

It is not a de Polignac number, because 101220302020021 - 2⁹ = 101220302019509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220302019977 and 101220302020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220302020051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196926657370 + ... + 196926657883.

It is an arithmetic number, because the mean of its divisors is an integer number (25403538833883).

Almost surely, 2^{101220302020021} is an apocalyptic number.

It is an amenable number.

101220302020021 is a deficient number, since it is larger than the sum of its proper divisors (393853315511).

101220302020021 is an equidigital number, since it uses as much as digits as its factorization.

101220302020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393853315510.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 101220302020021 its reverse (120020203022101), we get a palindrome (221240505042122).

The spelling of 101220302020021 in words is "one hundred one trillion, two hundred twenty billion, three hundred two million, twenty thousand, twenty-one".