101002020020021 has 4 divisors (see below), whose sum is σ = 101003113574700. Its totient is φ = 101000926465344.

The previous prime is 101002020020017. The next prime is 101002020020063. The reversal of 101002020020021 is 120020020200101.

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 51775378551121 + 49226641468900 = 7195511^2 + 7016170^2 .

It is a cyclic number.

It is not a de Polignac number, because 101002020020021 - 2² = 101002020020017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101002020019984 and 101002020020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101002020020071) 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, 546638786 + ... + 546823523.

It is an arithmetic number, because the mean of its divisors is an integer number (25250778393675).

Almost surely, 2^{101002020020021} is an apocalyptic number.

It is an amenable number.

101002020020021 is a deficient number, since it is larger than the sum of its proper divisors (1093554679).

101002020020021 is an equidigital number, since it uses as much as digits as its factorization.

101002020020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093554678.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 101002020020021 its reverse (120020020200101), we get a palindrome (221022040220122).

The spelling of 101002020020021 in words is "one hundred one trillion, two billion, twenty million, twenty thousand, twenty-one".