2102120000021 has 8 divisors (see below), whose sum is σ = 2114705214720. Its totient is φ = 2089568939008.

The previous prime is 2102119999963. The next prime is 2102120000039. The reversal of 2102120000021 is 1200000212012.

It is a happy number.

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 2102120000021 - 2¹⁴ = 2102119983637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102119999957 and 2102120000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102120000081) 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, 8414951 + ... + 8661156.

It is an arithmetic number, because the mean of its divisors is an integer number (264338151840).

Almost surely, 2^{2102120000021} is an apocalyptic number.

It is an amenable number.

2102120000021 is a deficient number, since it is larger than the sum of its proper divisors (12585214699).

2102120000021 is a wasteful number, since it uses less digits than its factorization.

2102120000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17076843.

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

Adding to 2102120000021 its reverse (1200000212012), we get a palindrome (3302120212033).

The spelling of 2102120000021 in words is "two trillion, one hundred two billion, one hundred twenty million, twenty-one", and thus it is an aban number.