3642123021 has 16 divisors (see below), whose sum is σ = 5025417600. Its totient is φ = 2343515328.

The previous prime is 3642123011. The next prime is 3642123073. The reversal of 3642123021 is 1203212463.

It is not a de Polignac number, because 3642123021 - 2⁵ = 3642122989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3642122982 and 3642123000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3642123011) 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, 317040 + ... + 328326.

It is an arithmetic number, because the mean of its divisors is an integer number (314088600).

Almost surely, 2^3642123021 is an apocalyptic number.

It is an amenable number.

3642123021 is a deficient number, since it is larger than the sum of its proper divisors (1383294579).

3642123021 is a wasteful number, since it uses less digits than its factorization.

3642123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15028.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 3642123021 is about 60350.0043164870. The cubic root of 3642123021 is about 1538.5733429732.

Adding to 3642123021 its reverse (1203212463), we get a palindrome (4845335484).

The spelling of 3642123021 in words is "three billion, six hundred forty-two million, one hundred twenty-three thousand, twenty-one".