3661434021 has 16 divisors (see below), whose sum is σ = 5594297984. Its totient is φ = 2086634304.

The previous prime is 3661434017. The next prime is 3661434031. The reversal of 3661434021 is 1204341663.

3661434021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3661434021 - 2² = 3661434017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3661434021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661434031) 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, 225886 + ... + 241551.

It is an arithmetic number, because the mean of its divisors is an integer number (349643624).

Almost surely, 2^3661434021 is an apocalyptic number.

It is an amenable number.

3661434021 is a deficient number, since it is larger than the sum of its proper divisors (1932863963).

3661434021 is a wasteful number, since it uses less digits than its factorization.

3661434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467820.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 3661434021 is about 60509.7845063094. The cubic root of 3661434021 is about 1541.2877884214.

Adding to 3661434021 its reverse (1204341663), we get a palindrome (4865775684).

The spelling of 3661434021 in words is "three billion, six hundred sixty-one million, four hundred thirty-four thousand, twenty-one".