2101200002021 has 16 divisors (see below), whose sum is σ = 2245621708800. Its totient is φ = 1961597489280.

The previous prime is 2101200001993. The next prime is 2101200002039. The reversal of 2101200002021 is 1202000021012.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2101200002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101200001993 and 2101200002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101200008021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4279496 + ... + 4745153.

It is an arithmetic number, because the mean of its divisors is an integer number (140351356800).

Almost surely, 2^{2101200002021} is an apocalyptic number.

It is an amenable number.

2101200002021 is a deficient number, since it is larger than the sum of its proper divisors (144421706779).

2101200002021 is a wasteful number, since it uses less digits than its factorization.

2101200002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9024916.

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

Adding to 2101200002021 its reverse (1202000021012), we get a palindrome (3303200023033).

The spelling of 2101200002021 in words is "two trillion, one hundred one billion, two hundred million, two thousand, twenty-one".