4102155221 has 4 divisors (see below), whose sum is σ = 4124819244. Its totient is φ = 4079491200.

The previous prime is 4102155203. The next prime is 4102155223. The reversal of 4102155221 is 1225512014.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2198578321 + 1903576900 = 46889^2 + 43630^2 .

It is a cyclic number.

It is not a de Polignac number, because 4102155221 - 2³⁰ = 3028413397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4102155223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11331740 + ... + 11332101.

It is an arithmetic number, because the mean of its divisors is an integer number (1031204811).

Almost surely, 2^4102155221 is an apocalyptic number.

It is an amenable number.

4102155221 is a deficient number, since it is larger than the sum of its proper divisors (22664023).

4102155221 is a wasteful number, since it uses less digits than its factorization.

4102155221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22664022.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 4102155221 is about 64048.0696118158. The cubic root of 4102155221 is about 1600.8010599401.

Adding to 4102155221 its reverse (1225512014), we get a palindrome (5327667235).

The spelling of 4102155221 in words is "four billion, one hundred two million, one hundred fifty-five thousand, two hundred twenty-one".