3642156121 has 4 divisors (see below), whose sum is σ = 3657269044. Its totient is φ = 3627043200.

The previous prime is 3642156107. The next prime is 3642156137. The reversal of 3642156121 is 1216512463.

It is a happy number.

3642156121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216512463 = 17551 ⋅69313.

It can be written as a sum of positive squares in 2 ways, for example, as 3317760000 + 324396121 = 57600^2 + 18011^2 .

It is a cyclic number.

It is not a de Polignac number, because 3642156121 - 2¹¹ = 3642154073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3642156521) 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, 7556100 + ... + 7556581.

It is an arithmetic number, because the mean of its divisors is an integer number (914317261).

Almost surely, 2^3642156121 is an apocalyptic number.

It is an amenable number.

3642156121 is a deficient number, since it is larger than the sum of its proper divisors (15112923).

3642156121 is a wasteful number, since it uses less digits than its factorization.

3642156121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15112922.

The product of its digits is 8640, while the sum is 31.

The square root of 3642156121 is about 60350.2785494814. The cubic root of 3642156121 is about 1538.5780038649.

Adding to 3642156121 its reverse (1216512463), we get a palindrome (4858668584).

The spelling of 3642156121 in words is "three billion, six hundred forty-two million, one hundred fifty-six thousand, one hundred twenty-one".