5661021421 has 12 divisors (see below), whose sum is σ = 6301220800. Its totient is φ = 5081230440.

The previous prime is 5661021389. The next prime is 5661021427. The reversal of 5661021421 is 1241201665.

It is not a de Polignac number, because 5661021421 - 2⁵ = 5661021389 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 5661021421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661021427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286551 + ... + 305668.

Almost surely, 2^5661021421 is an apocalyptic number.

It is an amenable number.

5661021421 is a deficient number, since it is larger than the sum of its proper divisors (640199379).

5661021421 is a wasteful number, since it uses less digits than its factorization.

5661021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592320 (or 592309 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 5661021421 is about 75239.7595756393. The cubic root of 5661021421 is about 1782.2348544807.

The spelling of 5661021421 in words is "five billion, six hundred sixty-one million, twenty-one thousand, four hundred twenty-one".