2110210100021 has 4 divisors (see below), whose sum is σ = 2111389649100. Its totient is φ = 2109030550944.

The previous prime is 2110210099973. The next prime is 2110210100023. The reversal of 2110210100021 is 1200010120112.

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 929130199396 + 1181079900625 = 963914^2 + 1086775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2110210100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2110210099975 and 2110210100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110210100023) 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, 589771856 + ... + 589775433.

It is an arithmetic number, because the mean of its divisors is an integer number (527847412275).

Almost surely, 2^{2110210100021} is an apocalyptic number.

It is an amenable number.

2110210100021 is a deficient number, since it is larger than the sum of its proper divisors (1179549079).

2110210100021 is a wasteful number, since it uses less digits than its factorization.

2110210100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179549078.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2110210100021 its reverse (1200010120112), we get a palindrome (3310220220133).

The spelling of 2110210100021 in words is "two trillion, one hundred ten billion, two hundred ten million, one hundred thousand, twenty-one".