5421731621 has 2 divisors, whose sum is σ = 5421731622. Its totient is φ = 5421731620.

The previous prime is 5421731617. The next prime is 5421731629. The reversal of 5421731621 is 1261371245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5315868100 + 105863521 = 72910^2 + 10289^2 .

It is a cyclic number.

It is not a de Polignac number, because 5421731621 - 2² = 5421731617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5421731629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2710865810 + 2710865811.

It is an arithmetic number, because the mean of its divisors is an integer number (2710865811).

Almost surely, 2^5421731621 is an apocalyptic number.

It is an amenable number.

5421731621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5421731621 is an equidigital number, since it uses as much as digits as its factorization.

5421731621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 5421731621 is about 73632.4087681505. The cubic root of 5421731621 is about 1756.7609612320.

The spelling of 5421731621 in words is "five billion, four hundred twenty-one million, seven hundred thirty-one thousand, six hundred twenty-one".