10211611562221 has 8 divisors (see below), whose sum is σ = 10216743962040. Its totient is φ = 10206479450112.

The previous prime is 10211611562219. The next prime is 10211611562249. The reversal of 10211611562221 is 12226511611201.

It can be written as a sum of positive squares in 4 ways, for example, as 931728798121 + 9279882764100 = 965261^2 + 3046290^2 .

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 10211611562221 - 2¹ = 10211611562219 is a prime.

It is a super-2 number, since 2×10211611562221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211611563221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120586731 + ... + 120671383.

It is an arithmetic number, because the mean of its divisors is an integer number (1277092995255).

Almost surely, 2^{10211611562221} is an apocalyptic number.

It is an amenable number.

10211611562221 is a deficient number, since it is larger than the sum of its proper divisors (5132399819).

10211611562221 is an equidigital number, since it uses as much as digits as its factorization.

10211611562221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143855.

The product of its (nonzero) digits is 2880, while the sum is 31.

The spelling of 10211611562221 in words is "ten trillion, two hundred eleven billion, six hundred eleven million, five hundred sixty-two thousand, two hundred twenty-one".