2120100001021 has 4 divisors (see below), whose sum is σ = 2120110538044. Its totient is φ = 2120089464000.

The previous prime is 2120100001009. The next prime is 2120100001037. The reversal of 2120100001021 is 1201000010212.

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 2074711828996 + 45388172025 = 1440386^2 + 213045^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120100001021 - 2⁵ = 2120100000989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120100000989 and 2120100001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120100001121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4960710 + ... + 5371111.

It is an arithmetic number, because the mean of its divisors is an integer number (530027634511).

Almost surely, 2^{2120100001021} is an apocalyptic number.

It is an amenable number.

2120100001021 is a deficient number, since it is larger than the sum of its proper divisors (10537023).

2120100001021 is a wasteful number, since it uses less digits than its factorization.

2120100001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10537022.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2120100001021 its reverse (1201000010212), we get a palindrome (3321100011233).

It can be divided in two parts, 2 and 120100001021, that multiplied together give a palindrome (240200002042).

The spelling of 2120100001021 in words is "two trillion, one hundred twenty billion, one hundred million, one thousand, twenty-one".