2101001222021 has 8 divisors (see below), whose sum is σ = 2283374653560. Its totient is φ = 1921593212352.

The previous prime is 2101001222017. The next prime is 2101001222041. The reversal of 2101001222021 is 1202221001012.

It can be written as a sum of positive squares in 4 ways, for example, as 10591291396 + 2090409930625 = 102914^2 + 1445825^2 .

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 2101001222021 - 2² = 2101001222017 is a prime.

It is a super-2 number, since 2×2101001222021² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2101001221987 and 2101001222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101001222041) 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, 741353990 + ... + 741356823.

It is an arithmetic number, because the mean of its divisors is an integer number (285421831695).

Almost surely, 2^{2101001222021} is an apocalyptic number.

It is an amenable number.

2101001222021 is a deficient number, since it is larger than the sum of its proper divisors (182373431539).

2101001222021 is a wasteful number, since it uses less digits than its factorization.

2101001222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482710935.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2101001222021 its reverse (1202221001012), we get a palindrome (3303222223033).

The spelling of 2101001222021 in words is "two trillion, one hundred one billion, one million, two hundred twenty-two thousand, twenty-one".