211220200001021 has 8 divisors (see below), whose sum is σ = 220667057703000. Its totient is φ = 201917569134400.

The previous prime is 211220200000987. The next prime is 211220200001101. The reversal of 211220200001021 is 120100002022112.

It can be written as a sum of positive squares in 4 ways, for example, as 101540890562500 + 109679309438521 = 10076750^2 + 10472789^2 .

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 211220200001021 - 2¹⁰ = 211220199999997 is a prime.

It is a super-2 number, since 2×211220200001021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211220200000987 and 211220200001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220200001821) 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, 36056705846 + ... + 36056711703.

It is an arithmetic number, because the mean of its divisors is an integer number (27583382212875).

Almost surely, 2^{211220200001021} is an apocalyptic number.

It is an amenable number.

211220200001021 is a deficient number, since it is larger than the sum of its proper divisors (9446857701979).

211220200001021 is a wasteful number, since it uses less digits than its factorization.

211220200001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72113417679.

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

Adding to 211220200001021 its reverse (120100002022112), we get a palindrome (331320202023133).

The spelling of 211220200001021 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred million, one thousand, twenty-one".