2102040021 has 8 divisors (see below), whose sum is σ = 2967585984. Its totient is φ = 1318927040.

The previous prime is 2102040019. The next prime is 2102040043. The reversal of 2102040021 is 1200402012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2102040021 - 2¹ = 2102040019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2102039979 and 2102040006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102040121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20608185 + ... + 20608286.

It is an arithmetic number, because the mean of its divisors is an integer number (370948248).

Almost surely, 2^2102040021 is an apocalyptic number.

It is an amenable number.

2102040021 is a deficient number, since it is larger than the sum of its proper divisors (865545963).

2102040021 is a wasteful number, since it uses less digits than its factorization.

2102040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41216491.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2102040021 is about 45848.0100004351. The cubic root of 2102040021 is about 1280.9936987833.

Adding to 2102040021 its reverse (1200402012), we get a palindrome (3302442033).

The spelling of 2102040021 in words is "two billion, one hundred two million, forty thousand, twenty-one".