10211220221 has 8 divisors (see below), whose sum is σ = 10813275000. Its totient is φ = 9609320448.

The previous prime is 10211220197. The next prime is 10211220259. The reversal of 10211220221 is 12202211201.

It can be written as a sum of positive squares in 4 ways, for example, as 529644196 + 9681576025 = 23014^2 + 98395^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10211220221 - 2³⁰ = 9137478397 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10211220196 and 10211220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211225221) 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, 114155 + ... + 182903.

It is an arithmetic number, because the mean of its divisors is an integer number (1351659375).

Almost surely, 2^10211220221 is an apocalyptic number.

It is an amenable number.

10211220221 is a deficient number, since it is larger than the sum of its proper divisors (602054779).

10211220221 is an equidigital number, since it uses as much as digits as its factorization.

10211220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77503.

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

Adding to 10211220221 its reverse (12202211201), we get a palindrome (22413431422).

The spelling of 10211220221 in words is "ten billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-one".