2101212212021 has 16 divisors (see below), whose sum is σ = 2265147990000. Its totient is φ = 1937606361600.

The previous prime is 2101212212017. The next prime is 2101212212053. The reversal of 2101212212021 is 1202122121012.

It can be written as a sum of positive squares in 8 ways, for example, as 670523511025 + 1430688700996 = 818855^2 + 1196114^2 .

It is not a de Polignac number, because 2101212212021 - 2² = 2101212212017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101212212221) 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, 80036105 + ... + 80062353.

It is an arithmetic number, because the mean of its divisors is an integer number (141571749375).

Almost surely, 2^{2101212212021} is an apocalyptic number.

It is an amenable number.

2101212212021 is a deficient number, since it is larger than the sum of its proper divisors (163935777979).

2101212212021 is a wasteful number, since it uses less digits than its factorization.

2101212212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32296.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2101212212021 its reverse (1202122121012), we get a palindrome (3303334333033).

The spelling of 2101212212021 in words is "two trillion, one hundred one billion, two hundred twelve million, two hundred twelve thousand, twenty-one".