10102111221 has 16 divisors (see below), whose sum is σ = 14434982784. Its totient is φ = 6267818304.

The previous prime is 10102111211. The next prime is 10102111231. The reversal of 10102111221 is 12211120101.

It is an interprime number because it is at equal distance from previous prime (10102111211) and next prime (10102111231).

It is not a de Polignac number, because 10102111221 - 2³³ = 1512176629 is a prime.

It is a super-2 number, since 2×10102111221² (a number of 21 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 = 10102111197 and 10102111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10102111211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1975926 + ... + 1981031.

It is an arithmetic number, because the mean of its divisors is an integer number (902186424).

Almost surely, 2^10102111221 is an apocalyptic number.

It is an amenable number.

10102111221 is a deficient number, since it is larger than the sum of its proper divisors (4332871563).

10102111221 is a wasteful number, since it uses less digits than its factorization.

10102111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957020.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 10102111221 its reverse (12211120101), we get a palindrome (22313231322).

The spelling of 10102111221 in words is "ten billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".