2120210200021 has 4 divisors (see below), whose sum is σ = 2120240398572. Its totient is φ = 2120180001472.

The previous prime is 2120210199983. The next prime is 2120210200057. The reversal of 2120210200021 is 1200020120212.

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 100244424996 + 2019965775025 = 316614^2 + 1421255^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120210200021 - 2⁹ = 2120210199509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120210199974 and 2120210200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120210200081) 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, 14993716 + ... + 15134461.

It is an arithmetic number, because the mean of its divisors is an integer number (530060099643).

Almost surely, 2^{2120210200021} is an apocalyptic number.

It is an amenable number.

2120210200021 is a deficient number, since it is larger than the sum of its proper divisors (30198551).

2120210200021 is an equidigital number, since it uses as much as digits as its factorization.

2120210200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30198550.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2120210200021 its reverse (1200020120212), we get a palindrome (3320230320233).

The spelling of 2120210200021 in words is "two trillion, one hundred twenty billion, two hundred ten million, two hundred thousand, twenty-one".