10261220121 has 6 divisors (see below), whose sum is σ = 14821762410. Its totient is φ = 6840813408.

The previous prime is 10261220089. The next prime is 10261220149. The reversal of 10261220121 is 12102216201.

10261220121 is a `hidden beast` number, since 10 + 2 + 612 + 20 + 1 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7012220121 + 3249000000 = 83739^2 + 57000^2 .

It is not a de Polignac number, because 10261220121 - 2⁵ = 10261220089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10261220094 and 10261220103.

It is not an unprimeable number, because it can be changed into a prime (10261210121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570067776 + ... + 570067793.

It is an arithmetic number, because the mean of its divisors is an integer number (2470293735).

Almost surely, 2^10261220121 is an apocalyptic number.

It is an amenable number.

10261220121 is a deficient number, since it is larger than the sum of its proper divisors (4560542289).

10261220121 is a wasteful number, since it uses less digits than its factorization.

10261220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140135575 (or 1140135572 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 10261220121 its reverse (12102216201), we get a palindrome (22363436322).

The spelling of 10261220121 in words is "ten billion, two hundred sixty-one million, two hundred twenty thousand, one hundred twenty-one".